Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.

Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive immune systems, while macrophages are involved in detecting, engulfing, and destroying pathogens and apoptotic cells. Lastly, fibroblast-like reticular cells provide a supportive framework for these cells, producing the stroma that forms the backbone of lymphoid organs.

On the other hand, lymphoid tissues are specialized connective tissues that provide a conducive environment for the growth and maturation of lymphocytes. Based on their structure, they can be categorized into two main types: diffuse and solid. Diffuse lymphoid tissues are loosely arranged clusters of lymphoid cells and reticular fibers, while solid lymphoid tissues form densely packed structures known as nodules.

A unique type of lymphoid tissue is the mucosa-associated lymphatic tissue (MALT), which is scattered across the mucus membranes lining the respiratory, digestive, reproductive, and urinary systems. MALT plays a vital role in the body's first line of defense by preventing the entry of pathogens through these membranes. It achieves this by producing antibodies and immune cells that can quickly respond to any invading pathogens.

In certain areas, such as the pharynx and intestinal walls, MALT can aggregate to form larger clusters, known as tonsils and Peyer's patches, respectively. These aggregated nodules serve as frontline soldiers, preventing microbes from entering the body.

Tags
Lymphoid CellsImmune SystemB LymphocytesT LymphocytesDendritic CellsMacrophagesLymphoid TissuesMucosa associated Lymphatic TissueMALTLymphoid OrgansSpleenThymusLymph NodesPathogen DefenseImmune Response

来自章节 25:

article

Now Playing

25.4 : Lymphoid Cells and Tissues

The Lymphatic and Immune System

408 Views

article

25.1 : 淋巴和免疫系统简介

The Lymphatic and Immune System

1.2K Views

article

25.2 : 淋巴和免疫系统的功能

The Lymphatic and Immune System

585 Views

article

25.3 : 淋巴管和淋巴运输

The Lymphatic and Immune System

604 Views

article

25.5 : 原代淋巴器官

The Lymphatic and Immune System

567 Views

article

25.6 : 次级淋巴器官

The Lymphatic and Immune System

460 Views

article

25.7 : 淋巴结的详细结构和功能

The Lymphatic and Immune System

470 Views

article

25.8 : 淋巴系统的发育

The Lymphatic and Immune System

189 Views

article

25.9 : 先天免疫和适应性免疫简介

The Lymphatic and Immune System

2.6K Views

article

25.10 : 表面膜屏障

The Lymphatic and Immune System

488 Views

article

25.11 : 先天免疫反应细胞

The Lymphatic and Immune System

850 Views

article

25.12 : 抗菌蛋白

The Lymphatic and Immune System

536 Views

article

25.13 : 补体系统

The Lymphatic and Immune System

1.5K Views

article

25.14 : NK 细胞和吞噬细胞的免疫监视

The Lymphatic and Immune System

687 Views

article

25.15 : 炎症反应

The Lymphatic and Immune System

1.3K Views

See More

JoVE Logo

政策

使用条款

隐私

科研

教育

关于 JoVE

版权所属 © 2025 MyJoVE 公司版权所有,本公司不涉及任何医疗业务和医疗服务。