نشكر جوس Burgert لمساعدة مع بعض الشخصيات. ونحن ممتنون لإنغو Selbach (ومجموعة &quot;Edelkrebsprojekt NRW&quot;) لجهوده الرامية إلى تزويد المختبر مع حيوانات التجارب. نشكر آنا C. شنايدر لتصحيح التجارب المطبعية الإصدارات الأولى من المخطوطة. وأيد هذا البحث من قبل منحة SM إيمي نويثر DFG 206 / 3-1 ومنحة بدء التشغيل من جامعة كولونيا لأعضاء هيئة التدريس من الإناث.

<ol>
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The authors declare that they have no competing financial interests.

<html> وقد وصفت تشريح جراد البحر والعقد من البطن سابقا 5 و 18 و 19 و 20 و فمن المستحسن أن تصبح على دراية بها قبل تشريح من أجل تجنب قطع الأعصاب الهامة. ومن الأهمية بمكان للحفاظ على التحضير في درجة حرارة أقل من 23 درجة مئوية إلى من?...

وswimmerets من جراد البحر تخدم وظيفة في السيطرة الموقف وضربت بشكل متوازن عندما تسبح الحيوانات إلى الأمام، تهوية الجحور أو الإناث بيضها تهوية 5 و 6. وswimmerets من جراد البحر إشارة، Pacifastacus leniusculus، تحدث في أزواج من الثاني إلى الخامس الجزء البطن، مع أطرافهم واحدة على كل جانب من البطن 7. ينتج الجهاز العصبي المركزي على الخاص طقطق محركها الإيقاعي الذي يحرك حركة swimmeret في الحيوان سليمة وكذلك في إعداد الحبل العصبي معزولة. عندما لا يكون هناك ردود الفعل الحسية أو تنازلي المدخلات الحالي يسمى النمط الإيقاعي السيارات المنتجة تنقل الوهمية 1 و 2. وفي النظام swimmeret لا يختلف هذا النمط الحركي في أي معلمة من نشاط swimmerets قياس في الحيوان سليمة. هو الدافع وراء حركة كل swimmeret من قبل المتناهية الصغر التي يقع في ويقتصر على واحدة جorresponding hemiganglion 1 - 3 في كل المتناهية الصغر هناك نمط توليد نواة والتي تضم خمسة interneurons غير ارتفاعه تحديدها. أنها يمكن أن توصف وظيفيا على أنها إما المانع من السكتة الدماغية الطاقة (IPS) أو المانع من العودة السكتة الدماغية (IRS) 8. هذه IPS وinterneurons IRS ليست مؤشرات التذبذب الذاتية، وليس هو الدافع وراء النشاط بالتناوب من خلال تثبيط متبادل 9. لأن هذه interneurons تمنع الخلايا العصبية الحركية swimmeret مباشرة، يتم إنشاء بالتناوب حركة PS-RS 10. تنقل ومع ذلك، لا تتطلب سوى توليد النشاط، ولكن أيضا التنسيق بين رقائق مستقلة مختلفة. في النظام swimmeret يتم تأسيس مثل هذا التنسيق من قبل المتناهية الصغر تنسيق الذي يضمن أن أطرافه تنشط في الأوقات الصحيحة. تم بناء هذا المتناهية الصغر من قبل ثلاثة الخلايا العصبية التي تم تحديدها في كل قطعة 11-15. يوفر هذا البروتوكول لعشرالبريد أول مرة دليلا تشريح خطوة بخطوة لعزل سلسلة من العقد (T4 إلى A6، الشكل 1). وتبين لنا كيفية يعلقون عليه معزولة في البطن الحبل العصبي وdesheathe كل عقدة. في هذا معزولة إعداد الجهاز العصبي، الخلايا العصبية المسؤولة عن الحركة swimmeret جاهزة للاستخدام في التجارب الكهربية والصرفية. الجزء الثاني من هذا البروتوكول يوضح الملامح الرئيسية لنمط المحرك swimmeret. ويشمل هذا دليل خطوة بخطوة لتسجيل خارج الخلية من نشاط الخلايا العصبية الحركية swimmeret. محاور الخلايا العصبية الحركية RS المشروع من خلال فرع الأمامي من N1 العصبية، في حين تتوقع بعض محاور الخلايا العصبية الحركية PS من خلال فرع الخلفي من نفس العصب (الشكل 1) 4. لذا نشاطهم يمكن تسجيل من هذه الفروع مع أقطاب دبوس التفاضلية. <img alt="الشكل (1)" fo:content-width="2in" src="/files/ftp_upload/52109/52109fig1highres.jpg" width="200" /><br/&gt; الشكل 1: المعزولة الجهاز العصبي من العقدة الصدرية 4 (T4) إلى العقدة في البطن 6 (A6) والرسم التخطيطي منه T4: العقدة الصدرية 4؛ T5: العقدة الصدرية 5؛ A1، A2 ... A6 العقدة في البطن 1، العقدة في البطن 2 ... العقدة في البطن 6؛ N1: العصبية N1. N2: العصبية N2. N3: العصبية N3. PS: السلطة السكتة الدماغية. RS: عودة-السكتة الدماغية. الاختصارات الاتجاه: A = الأمامي. P = الخلفي. هذا الإجراء تشريح وتقنية الكهربية أثبتت ومريحة لطلاب المرحلة الجامعية ويمكن أن تكمل الدورات العملية طالب في علم وظائف الأعضاء. وقد استخدم سلسلة معزولة من العقد في عدد من التجارب لدراسة العصبي وظيفة الجهاز، والتنسيق، أو تعديل من رقائق swimmeret 6 فضلا عن السيطرة العصبية من السلوك التكيفي في تنقل 16، 17. وهكذا فإن نظام جراد البحر swimmeret يوفر وجود كمية هائلة التدريس مثيرة للاهتمام أو تيتمطر الفرص التي تبدأ مع كل تشريح الحبل العصبي البطني من جراد البحر وتسجيل خارج الخلية من نمط السيارات الوهمية.

<table border="0" cellpadding="0" cellspacing="0" width="606">
	<tbody>
		<tr height="38">
			<td height="38" style="height:38px;width:131px;">Name of Material/ Equipment</td>
			<td style="width:131px;">Type</td>
			<td style="width:139px;">Company</td>
			<td style="width:103px;">Catalog Number</td>
			<td style="width:103px;">Comments/&#160;&#160; Description</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">4-channel extracellular amplifier: MA 102&#160;</td>
			<td style="width:131px;">Amplifier</td>
			<td style="width:139px;">Elektroniklabor, Zoologie, Universit&#228;t zu K&#246;ln, Germany</td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="160">
			<td height="160" style="height:160px;width:131px;">air-table</td>
			<td style="width:131px;"></td>
			<td style="width:139px;">Technical Manufacturing Corporation 
			(TMC) a unit of AMETEK Ultra Precision Technologies, Peabody, MA, USA</td>
			<td style="width:103px;">63-534</td>
			<td style="width:103px;">for intracellular recording</td>
		</tr>
		<tr height="80">
			<td height="80" style="height:80px;width:131px;">Axon Digidata 1440A</td>
			<td style="width:131px;">Digitizer</td>
			<td style="width:139px;">Axon Instruments, Molecular Devices Design, Union City, CA</td>
			<td style="width:103px;">DD1440A</td>
			<td style="width:103px;">digitizes recorded signals&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:131px;">big bucket&#160;</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">filled with ice</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">Clampex &#38; Clampfit</td>
			<td style="width:131px;">pClamp 10, recording and analysis software</td>
			<td style="width:139px;">Molecular Devices Design, Union City, CA</td>
			<td style="width:103px;">pClamps 10 Standard</td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">cold lamp source</td>
			<td style="width:131px;">with flexible light guide (fiber optic bundle)&#160;</td>
			<td style="width:139px;">Euromex microscopes holland, Arnhem, BD</td>
			<td style="width:103px;">LE.5211 &#38; LE.5235</td>
			<td style="width:103px;"></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">computer and monitor</td>
			<td style="width:131px;">equipped with recording software</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">container and pipette for liquid waste&#160;</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;"></td>
		</tr>
		<tr height="160">
			<td height="160" style="height:160px;width:131px;">crayfish saline&#160;</td>
			<td style="width:131px;">contains (in mM): 5.4 KCl, 2.6 MgCl2, 13.5 CaCl2, and 195 NaCl, buffered with 10mM Tris base and 4.7mM maleic acid; aerated for 3 hours. Adjust at pH of 7.4.&#160;</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">always keep at temperatures ~ 4&#176; C</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">dextran, Texas Red (3000MW, lysine fixable)</td>
			<td style="width:131px;">fluorescent dye, lysine fixable</td>
			<td style="width:139px;">Life Technologies GmbH, Darmstadt, Germany</td>
			<td style="width:103px;">D3328</td>
			<td style="width:103px;">for intracellular dyefill of neurons</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">differential pin electrodes</td>
			<td style="width:131px;">made from stainless steel &#632; 0.2 mm</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">dissection dish&#160;</td>
			<td style="width:131px;">(l x w x h) 15x7x5 cm; linned with black silicone</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">used in the gross disection</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">faraday cage</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">fixing pins</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for pinning the specimen</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">forceps (biology, Dumont #5)</td>
			<td style="width:131px;">Forceps: Biology, tip 0.05 x 0.02 mm, length 11cm, INOX</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">11252-20</td>
			<td style="width:103px;">fine forceps: used to pick nerves</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">forceps (biology, Dumont #55)</td>
			<td style="width:131px;">Forceps: Biology, tip 0.05 x 0.02 mm, length 11cm, INOX</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">11255-20</td>
			<td style="width:103px;">extra fine forceps: used for desheathing</td>
		</tr>
		<tr height="80">
			<td height="80" style="height:80px;width:131px;">forceps (electronic, Dumont #5)</td>
			<td style="width:131px;">Forceps: Standard, tip 0.1 x 0.06 mm, length 11cm, INOX</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">11251-20</td>
			<td style="width:103px;">coarse forceps:&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; used to grab specimen and pins</td>
		</tr>
		<tr height="120">
			<td height="120" style="height:120px;width:131px;">intracellular electrode</td>
			<td style="width:131px;">Borosilicate glass capillaries (outer/inner diameter: 1mm/0.5mm), with filament</td>
			<td style="width:139px;">Sutter Instruments, Novato, CA</td>
			<td style="width:103px;">BF100-50-10</td>
			<td style="width:103px;">for intracellular recording and dyefill of neurons</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">Leica S8 Apo StereoZoom</td>
			<td style="width:131px;">Dissection Microscope&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Zoom 1x - 8x</td>
			<td style="width:139px;">Leica, Germany</td>
			<td style="width:103px;">10446298</td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">microscope table</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">mirror</td>
			<td style="width:131px;">to illuminate preparation from below</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:131px;">modeling clay</td>
			<td style="width:131px;"></td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">Olympus SZ61</td>
			<td style="width:131px;">Dissection Microscope&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Zoom 0.67x - 4.5x</td>
			<td style="width:139px;">Olympus, Germany</td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for the dissection</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">petri dish&#160;</td>
			<td style="width:131px;">94 x 16 mm; lined with clear silicone</td>
			<td style="width:139px;">Greiner bio-one, Germany</td>
			<td style="width:103px;">633180</td>
			<td style="width:103px;">used to pin the isolated chain of ganglia</td>
		</tr>
		<tr height="80">
			<td height="80" style="height:80px;width:131px;">ring scissors</td>
			<td style="width:131px;">ThoughCut, cutting edge: sharp/blunt, straight: 13cm</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">14054-13</td>
			<td style="width:103px;">for gross dissection&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; (steps 2.1 - 2.11)</td>
		</tr>
		<tr height="100">
			<td height="100" style="height:100px;width:131px;">saline dispenser&#160; with a 16 gauge needle (outer &#632; 1.6mm) attached via a flexible tube.</td>
			<td style="width:131px;">Volume ~ 60ml,</td>
			<td style="width:139px;"></td>
			<td style="width:103px;"></td>
			<td style="width:103px;">used for exsanguination</td>
		</tr>
		<tr height="120">
			<td height="120" style="height:120px;width:131px;">spring scissors or alternative: Vannas spring scissors</td>
			<td style="width:131px;">cutting edge: 8 mm, tip diameter: 0.2mm, straight: 10cm or cutting edge 2.5 mm, tip diameter 0.075 mm, straight: 8cm</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">15024-10 or&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; 15000-08</td>
			<td style="width:103px;">for desheathing&#160;</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:131px;">stainless steel wire &#632; 0.125 mm&#160;</td>
			<td style="width:131px;">to cut pins of 4-7 mm length</td>
			<td style="width:139px;">Goodfellow GmbH, Bad Nauheim, Germany</td>
			<td style="width:103px;"></td>
			<td style="width:103px;">for pinning of the nerve cord</td>
		</tr>
		<tr height="140">
			<td height="140" style="height:140px;width:131px;">student Vannas&#160; spring scissors or alternative:&#160; Moria Spring Scissors</td>
			<td style="width:131px;">cutting edge: 5mm, tip diameter: 0.35mm, straight: 9cm or cutting edge: 5mm, tip diameter 0,1 mm, straight: 8 cm</td>
			<td style="width:139px;">Fine Science Tools (FST), Germany</td>
			<td style="width:103px;">91500-09 or&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; 15396-00</td>
			<td style="width:103px;">for gross and fine disection&#160;&#160;&#160;&#160;&#160;&#160;&#160; (steps 2.11 - 3.14)</td>
		</tr>
		<tr height="100">
			<td height="100" style="height:100px;width:131px;">sylgard</td>
			<td style="width:131px;">184 Silicone Elastomer Base and Curing Agent; for black sylgard add activated carbon</td>
			<td style="width:139px;">Dow Corning, Midland, MI, USA</td>
			<td style="width:103px;"></td>
			<td style="width:103px;"></td>
		</tr>
		<tr height="100">
			<td height="100" style="height:100px;width:131px;">syringe filled with petroleum jelly and equipped with a 20 gauche needle with rounded tip</td>
			<td></td>
			<td></td>
			<td></td>
			<td style="width:103px;">for extracellular recording</td>
		</tr>
	</tbody>
</table>

the swimmeret system of crayfish: a practical guide for the dissection of the nerve cord and extracellular recordings of the motor pattern

نحن هنا لشرح تشريح جراد البحر البطن الحبل العصبي. إعداد ويضم اثنين من العقد الماضي الصدري (T4، T5) وسلسلة من العقد في البطن (A1 إلى A6). هذه السلسلة من العقد تشمل ذلك الجزء من الجهاز العصبي المركزي (CNS) التي تقود تحرك منسق من pleopods (swimmerets): النظام swimmeret. ومن المعروف عن أكثر من خمسة عقود أنه في جراد البحر هو الدافع وراء كل swimmeret التي كتبها نمط توليد مستقلة نواة الخاصة التي تولد النشاط بالتناوب الإيقاعي 1-3. الخلايا العصبية الحركية التعصيب عضلات كل swimmeret تشمل اثنين تشريحيا ووظيفيا السكان متميز 4. واحد هو المسؤول عن تراجع (السكتة الدماغية السلطة، PS) من swimmeret. والآخر يدفع إطالة (العودة السكتة الدماغية، RS) من swimmeret. الخلايا العصبية الحركية من النظام swimmeret هي قادرة على انتاج عفويا نمط السيارات الوهمية، وهو مطابق للنمط المسجلة في الجسم الحي </م&gt; 1. والهدف من هذا التقرير هو إدخال نظام نموذجي للاهتمام ومريحة لدراسة شبكات توليد الإيقاع وتنسيق رقائق مستقلة لدورات المختبر العملي للطلاب. ويتضمن البروتوكول ينص خطوة بخطوة تعليمات لتشريح البطن الحبل العصبي جراد البحر، وتعلق من سلسلة معزولة من العقد، desheathing في العقد وتسجيل swimmerets نمط المحرك الوهمية خارج الخلية من الجهاز العصبي معزولة. بالإضافة إلى ذلك، يمكننا مراقبة نشاط الخلايا العصبية swimmeret سجلت داخل الخلية من التشعبات. هنا أيضا يمكننا وصف موجز هذه التقنيات وتقديم بعض الأمثلة. وعلاوة على ذلك، مورفولوجيا الخلايا العصبية swimmeret يمكن تقييم باستخدام تقنيات تلوين مختلفة. نحن هنا تقديم أمثلة من داخل الخلايا (عن طريق الرحلان الشاردي) صبغ شغل في الخلايا العصبية وbackfills من برك من الخلايا العصبية الحركية swimmeret. في مختبرنانستخدم هذا التحضير لدراسة وظائف أساسية للتنقل الوهمية، وأثر من ردود الفعل الحسي على نشاط الجهاز العصبي المركزي، والتنسيق بين رقائق على المستوى الخلوي.

مع التسجيلات خارج الخلية في وقت واحد من RS وPS، الخلايا العصبية الحركية من عقدة واحدة، والنشاط بالتناوب من هذه البرك الخلايا العصبية الحركية، ويمكن رصد (الشكل 18)، وهو ما يمثل نمط تنقل الوهمية. <img alt="الرقم 18" src="/files/ftp_upload/52109/5...

Watch this Scientific Journal Video about The Swimmeret System of Crayfish: A Practical Guide for the Dissection of the Nerve Cord and Extracellular Recordings of the Motor Pattern at JoVE.com

The Swimmeret System of Crayfish: A Practical Guide for the Dissection of the Nerve Cord and Extracellular Recordings of the Motor Pattern

Here we describe the dissection of the crayfish abdominal nerve cord. We also demonstrate an electrophysiological technique to record fictive locomotion from swimmeret motor neurons.

نظام Swimmeret من جراد البحر: دليل عملي للتشريح من الحبل العصب وخارج الخلية تسجيلات من نمط للسيارات

Here we demonstrate the dissection of the crayfish abdominal nerve cord. The preparation comprises the last two thoracic ganglia (T4, T5) and the chain of ...

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11.9K Views.  University of Cologne. Here we describe the dissection of the crayfish abdominal nerve cord. We also demonstrate an electrophysiological technique to record fictive locomotion from swimmeret motor neurons. 

Video: The Swimmeret System of Crayfish: A Practical Guide for the Dissection of the Nerve Cord and Extracellular Recordings of the Motor Pattern

Multielectrode Array Recordings of the Vomeronasal Epithelium

Understanding neural circuits requires methods to record from many neurons simultaneously. For in vitro studies, one currently available technology is planar multielectrode array (MEA) recording. Here we document the use of MEAs to study the mouse vomeronasal organ (VNO), which plays an essential role in the detection of pheromones and social cues via a diverse population of sensory neurons expressing hundreds of types of receptors. Combining MEA recording with a robotic liquid handler to deliver chemical stimuli, the sensory responses of a large and diverse population of neurons can be recorded. The preparation allows us to remove the intact neuroepithelium of the VNO from the mouse and stimulate with a battery of chemicals or potential ligands while monitoring the electrical activity of the neurons for several hours. Therefore, this technique serves as a useful method for assessing ligand activity as well as exploring the properties of receptor neurons. We present the techniques needed to prepare the vomeronasal epithelium, MEA recording, and chemical stimulation.

Multielectrode array (MEA) recordings provide a method for studying the electrical activity of large populations of neurons. Here, we present the details of a MEA preparation to record from the mouse vomeronasal epithelium while simultaneously stimulating the tissue.

تسجيلات صفيف Multielectrode من الطلائية الميكعي

Understanding neural circuits requires methods to record from many neurons simultaneously. For in vitro studies, one currently available technology is ...

Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle

We explain in detail how to expose and conduct electrophysiological recordings of synaptic responses for high (phasic) and low (tonic) output motor neurons innervating the extensor muscle in the walking leg of a crayfish. Distinct differences are present in the physiology and morphology of the phasic and tonic nerve terminals. The tonic axon contains many more mitochondria, enabling it to take a vital stain more intensely than the phasic axon. The tonic terminals have varicosities, and the phasic terminal is filiform. The tonic terminals are low in synaptic efficacy but show dramatic facilitated responses. In contrast, the phasic terminals are high in quantal efficacy but show synaptic depression with high frequency stimulation. The quantal output is measured with a focal macropatch electrode placed directly over the visualized nerve terminals. Both phasic and tonic terminals innervate the same muscle fibers, which suggests that inherent differences in the neurons, rather than differential retrograde feedback from the muscle, account for the morphological and physiological differentiation.

This article demonstrates how to conduct electrophysiological recordings of synaptic responses on the extensor muscle in the walking leg of a crayfish and how the nerve terminals are visualized to show the gross morphological differences of high- and low-output nerve terminals.

الفسيولوجية تسجيلات NMJs المخرجات العالية والمنخفضة على العضلة الباسطة جراد البحر الساق

We explain in detail how to expose and conduct electrophysiological recordings of synaptic responses for high (phasic) and low (tonic) output motor ...

Spinal Cord Electrophysiology II: Extracellular Suction Electrode Fabrication

Development of neural circuitries and locomotion can be studied using neonatal rodent spinal cord central pattern generator (CPG) behavior. We demonstrate a method to fabricate suction electrodes that are used to examine CPG activity, or fictive locomotion, in dissected rodent spinal cords. The rodent spinal cords are placed in artificial cerebrospinal fluid and the ventral roots are drawn into the suction electrode. The electrode is constructed by modifying a commercially available suction electrode. A heavier silver wire is used instead of the standard wire given by the commercially available electrode. The glass tip on the commercial electrode is replaced with a plastic tip for increased durability. We prepare hand drawn electrodes and electrodes made from specific sizes of tubing, allowing consistency and reproducibility. Data is collected using an amplifier and neurogram acquisition software. Recordings are performed on an air table within a Faraday cage to prevent mechanical and electrical interference, respectively.

A demonstration of the fabrication and use of an extracellular suction electrode used to measure electrophysiological recordings of neonatal rodent spinal cords in vitro

الحبل الشوكي الكهربية ثانيا : خارج الخلية التصنيع الكهربائي شفط

Development of neural circuitries and locomotion can be studied using neonatal rodent spinal cord central pattern generator (CPG) behavior. We demonstrate ...

Whole Mount Preparation of the Adult Drosophila Ventral Nerve Cord for Giant Fiber Dye Injection

To analyze the axonal and dendritic morphology of neurons, it is essential to obtain accurate labeling of neuronal structures. Preparing well labeled samples with little to no tissue damage enables us to analyze cell morphology and to compare individual samples to each other, hence allowing the identification of mutant anomalies.
In the demonstrated dissection method the nervous system remains mostly inside the adult fly. Through a dorsal incision, the abdomen and thorax are opened and most of the internal organs are removed. Only the dorsal side of the ventral nerve cord (VNC) and the cervical connective 
(CvC) containing the big axons of the giant fibers (GFs)1 are exposed, while the brain containing the GF cell body and dendrites remains2 in the 
intact head. In this preparation most nerves of the VNC should remain attached to their muscles. 
Following the dissection, the intracellular filling of the giant fiber (GF) with a fluorescent dye is demonstrated. In the CvC the GF axons are located at the dorsal surface and thus can be easily visualized under a microscope with differential interference contrast (DIC) optics. This allows the injection of the GF axons with dye at this site to label the entire GF including the axons and their terminals in the VNC. This method results in reliable and strong staining of the GFs allowing the neurons to be imaged immediately after filling with an epifluorescent microscope. Alternatively, the fluorescent signal can be enhanced using standard immunohistochemistry procedures3 suitable for high resolution confocal microscopy.

Whole Mount Preparation of the Adult Drosophila Ventral Nerve Cord for Giant Fiber Dye Injection

An in vivo dissection of the adult Drosophila ventral nerve cord (VNC) is demonstrated. This particular dissection method causes little damage to the VNC allowing the subsequent labeling of the giant fiber neurons with fluorescent dye for high resolution imaging.

كله من جبل إعداد الكبار ذبابة الفاكهة الحبل الاعصاب الاماميه للحقن صبغ الألياف العملاق

To analyze the axonal and dendritic morphology of neurons, it is essential to obtain accurate labeling of neuronal structures. Preparing well labeled ...

Tissue Preparation and Immunostaining of Mouse Sensory Nerve Fibers Innervating Skin and Limb Bones

Detection and primary processing of physical, chemical and thermal sensory stimuli by peripheral sensory nerve fibers is key to sensory perception in animals and humans. These peripheral sensory nerve fibers express a plethora of receptors and ion channel proteins which detect and initiate specific sensory stimuli. Methods are available to characterize the electrical properties of peripheral sensory nerve fibers innervating the skin, which can also be utilized to identify the functional expression of specific ion channel proteins in these fibers. However, similar electrophysiological methods are not available (and are also difficult to develop) for the detection of the functional expression of receptors and ion channel proteins in peripheral sensory nerve fibers innervating other visceral organs, including the most challenging tissues such as bone. Moreover, such electrophysiological methods cannot be utilized to determine the expression of non-excitable proteins in peripheral sensory nerve fibers. Therefore, immunostaining of peripheral/visceral tissue samples for sensory nerve fivers provides the best possible way to determine the expression of specific proteins of interest in these nerve fibers. So far, most of the protein expression studies in sensory neurons have utilized immunostaining procedures in sensory ganglia, where the information is limited to the expression of specific proteins in the cell body of specific types or subsets of sensory neurons. Here we report detailed methods/protocols for the preparation of peripheral/visceral tissue samples for immunostaining of peripheral sensory nerve fibers. We specifically detail methods for the preparation of skin or plantar punch biopsy and bone (femur) sections from mice for immunostaining of peripheral sensory nerve fibers. These methods are not only key to the qualitative determination of protein expression in peripheral sensory neurons, but also provide a quantitative assay method for determining changes in protein expression levels in specific types or subsets of sensory fibers, as well as for determining the morphological and/or anatomical changes in the number and density of sensory fibers during various pathological states. Further, these methods are not confined to the staining of only sensory nerve fibers, but can also be used for staining any types of nerve fibers in the skin, bones and other visceral tissue.

Immunocytochemical identification of peripheral sensory nerve fiber subtypes (and detection of protein expression therein) are key to the understanding of molecular mechanisms underlying peripheral sensation. Here we describe methods for preparation of peripheral/visceral tissue samples, such as skin and limb bones, for specific immunostaining of peripheral sensory nerve fibers.

تحضير الأنسجة وImmunostaining من الألياف العصبية الحسية ماوس التعصيب الجلد والعظام الاطراف

Detection and primary processing of physical, chemical and thermal sensory stimuli by peripheral sensory nerve fibers is key to sensory perception in ...

A Simple One-step Dissection Protocol for Whole-mount Preparation of Adult Drosophila Brains

There is an increasing interest in using Drosophila to model human brain degenerative diseases, map neuronal circuitries in adult brains, and study the molecular and cellular basis of higher brain functions. A whole-mount preparation of adult brains with well-preserved morphology is critical for such whole brain-based studies, but can be technically challenging and time-consuming. This protocol describes an easy-to-learn, one-step dissection approach of an adult fly head in less than 10 s, while keeping the intact brain attached to the rest of the body to facilitate subsequent processing steps. The procedure helps remove most of the eye and tracheal tissues normally associated with the brain that can interfere with the later imaging step, and also places less demand on the quality of the dissecting forceps. Additionally, we describe a simple method that allows convenient flipping of the mounted brain samples on a coverslip, which is important for imaging both sides of the brains with similar signal intensity and quality. As an example of the protocol, we present an analysis of dopaminergic (DA) neurons in adult brains of WT (w1118) flies. The high efficacy of the dissection method makes it particularly useful for large-scale adult brain-based studies in Drosophila.

A Simple One-step Dissection Protocol for Whole-mount Preparation of Adult Drosophila Brains

The adult Drosophila brain is a valuable system for studying neuronal circuitry, higher brain functions, and complex disorders. An efficient method to dissect whole brain tissue from the small fly head will facilitate brain-based studies. Here we describe a simple, one-step dissection protocol of adult brains with well-preserved morphology.

وبسيطة خطوة واحدة بروتوكول تشريح لجبل لالجامع إعداد الكبار<em&gt; ذبابة الفاكهة</em&gt; أدمغة

There is an increasing interest in using Drosophila to model human brain degenerative diseases, map neuronal circuitries in adult brains, and study the ...

Visualization of the Axonal Projection Pattern of Embryonic Motor Neurons in Drosophila

The establishment of functional neuromuscular circuits relies on precise connections between developing motor axons and target muscles. Motor neurons extend growth cones to navigate along specific pathways by responding to a large number of axon guidance cues that emanate from the surrounding extracellular environment. Growth cone target recognition also plays a critical role in neuromuscular specificity. This work presents a standard immunohistochemistry protocol to visualize motor neuron projections of late stage-16 Drosophila melanogaster embryos. This protocol includes a few key steps, including a genotyping procedure, to sort the desired mutant embryos; an immunostaining procedure, to tag embryos with fasciclin II (FasII) antibody; and a dissection procedure, to generate filleted preparations from fixed embryos. Motor axon projections and muscle patterns in the periphery are much better visualized in flat preparations of filleted embryos than in whole-mount embryos. Therefore, the filleted preparation of fixed embryos stained with FasII antibody provides a powerful tool to characterize the genes required for motor axon pathfinding and target recognition, and it can also be applied to both loss-of-function and gain-of-function genetic screens.

Visualization of the Axonal Projection Pattern of Embryonic Motor Neurons in Drosophila

This work details a standard immunohistochemistry method to visualize motor neuron projections of late stage-16 Drosophila melanogaster embryos. The filleted preparation of fixed embryos stained with FasII antibody provides a powerful tool to characterize the genes required for motor axon pathfinding and target recognition during neural development.

التصور من محور الإسقاط نمط من الخلايا العصبية المحرك الجنينية في<em&gt; ذبابة الفاكهة</em

The establishment of functional neuromuscular circuits relies on precise connections between developing motor axons and target muscles. Motor neurons ...

Recording Synaptic Plasticity in Acute Hippocampal Slices Maintained in a Small-volume Recycling-, Perfusion-, and Submersion-type Chamber System

Even though experiments on brain slices have been in use since 1951, problems remain that reduce the probability of achieving a stable and successful analysis of synaptic transmission modulation when performing field potential or intracellular recordings. This manuscript describes methodological aspects that might be helpful in improving experimental conditions for the maintenance of acute brain slices and for recording field excitatory postsynaptic potentials in a commercially available submersion chamber with an outflow-carbogenation unit. The outflow-carbogenation helps to stabilize the oxygen level in experiments that rely on the recycling of a small buffer reservoir to enhance the cost-efficiency of drug experiments. In addition, the manuscript presents representative experiments that examine the effects of different carbogenation modes and stimulation paradigms on the activity-dependent synaptic plasticity of synaptic transmission.

This protocol describes the stabilization of the oxygen level in a small volume of recycled buffer and methodological aspects of recording activity-dependent synaptic plasticity in submerged acute hippocampal slices.

تسجيل اللدونة متشابك في شرائح هيبوكامبال الحاد تحتفظ في صغيرة الحجم-إعادة التدوير، ونضح-، وغمر من نوع نظام الدائرة

Even though experiments on brain slices have been in use since 1951, problems remain that reduce the probability of achieving a stable and successful ...

In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal

An increasing number of super-resolution microscopy techniques are helping to uncover the mechanisms that govern the nanoscale cellular world. Single-molecule imaging is gaining momentum as it provides exceptional access to the visualization of individual molecules in living cells. Here, we describe a technique that we developed to perform single-particle tracking photo-activated localization microscopy (sptPALM) in Drosophila larvae. Synaptic communication relies on key presynaptic proteins that act by docking, priming, and promoting the fusion of neurotransmitter-containing vesicles with the plasma membrane. A range of protein-protein and protein-lipid interactions tightly regulates these processes and the presynaptic proteins therefore exhibit changes in mobility associated with each of these key events. Investigating how mobility of these proteins correlates with their physiological function in an intact live animal is essential to understanding their precise mechanism of action. Extracting protein mobility with high resolution in vivo requires overcoming limitations such as optical transparency, accessibility, and penetration depth. We describe how photoconvertible fluorescent proteins tagged to the presynaptic protein Syntaxin-1A can be visualized via slight oblique illumination and tracked at the motor nerve terminal or along the motor neuron axon of the third instar Drosophila larva.

In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal

Here we illustrate how single molecule photo-activated localization microscopy can be carried out on the motor nerve terminal of a live Drosophila melanogaster third instar larva.

في فيفو تتبع في محطة Presynaptic الأعصاب الحركية المورفولوجية جزيء واحد

An increasing number of super-resolution microscopy techniques are helping to uncover the mechanisms that govern the nanoscale cellular world. ...

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks

Accurately and reliably identifying spatial orientation of the isolated mouse retina is important for many studies in visual neuroscience, including the analysis of density and size gradients of retinal cell types, the direction tuning of direction-selective ganglion cells, and the examination of topographic degeneration patterns in some retinal diseases. However, there are many different ocular dissection methods reported in the literature that are used to identify and label retinal orientation in the mouse retina. While the method of orientation used in such studies is often overlooked, not reporting how retinal orientation is determined can cause discrepancies in the literature and confusion when attempting to compare data between studies. Superficial ocular landmarks such as corneal burns are commonly used but have recently been shown to be less reliable than deeper landmarks such as the rectus muscles, the choroid fissure, or the s-opsin gradient. Here, we provide a comprehensive guide for the use of deep ocular landmarks to accurately dissect and document the spatial orientation of an isolated mouse retina. We have also compared the effectiveness of two s-opsin antibodies and included a protocol for s-opsin immunohistochemistry. Because orientation of the retina according to the s-opsin gradient requires retinal reconstruction with Retistruct software and rotation with custom code, we have presented the important steps required to use both of these programs. Overall, the goal of this protocol is to deliver a reliable and repeatable set of methods for accurate retinal orientation that is adaptable to most experimental protocols. An overarching goal of this work is to standardize retinal orientation methods for future studies.

This protocol provides a comprehensive dissection and analysis guide for the use of deep ocular landmarks, s-opsin immunohistochemistry, Retistruct, and custom code to accurately and reliably orient the isolated mouse retina in anatomical space.

حيث قمت بقص المسائل: تشريح وتحليل دليل للتوجه المكاني للشبكية الماوس من معالم بصري

Accurately and reliably identifying spatial orientation of the isolated mouse retina is important for many studies in visual neuroscience, including the ...