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Immune System

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The Structure of the Immune System

Organs of the Immune System

The organs of the immune system are positioned throughout the body; tonsils and adenoids, lymph nodes, lympathic vessels, thymus, spleen, appendix, Peyer's patch, and bone marrow.
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Lymph Node

The lymph node contains numerous specialized structures. T cells concentrate in the paracortex, B cells in and around the germinal centers, and plasma cells in the medulla. This image shows the incoming lymph vessle, follicles, germinal center, paracortex, cortex, medulla, a vein and an artery, and the outgoing lymph vessel.
The lymph node contains numerous specialized structures. T cells concentrate in the paracortex, B cells in and around the germinal centers, and plasma cells in the medulla. View credit information

Lymphatic Vessel

An image of lymph nodes interconnected by lymphatic vessels in the body.
Immune cells and foreign particles enter the lymph nodes via incoming lymphatic vessels or the lymph nodes’ tiny blood vessels. View credit information

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Last Updated October 02, 2008