Histology Guide

virtual microscopy laboratory

Chapter 10 - Lymphoid System

The lymphoid system contains cells, tissues, and organs that protect the body from pathogens, foreign substances, and elimination of diseased cells.

Lymph Node

Lymph nodes are major sites for lymphocytes and are distributed along lymphatic vessels. They filter lymph passing through the nodes to remove pathogens, debris, and cancer cells.

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Reticular Fibers
SEM

Lymphathic Vessels

Lymphatic capillaries are thin-walled vessels the drain and process extracellular tissue fluids. The fluid is mostly plasma that has leaked out of blood vessels into the interstitial space of tissues.

An example of lymphatic capillaries draining fluid from a tissue is the small intestine. The interior is covered by projections (villi) that contain lymphatic capillaries (lacteals).

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Vascular/Lymphatic Cast
SEM

Spleen

The spleen is an encapsulated organ involved in the filtration of blood and immunologically monitors blood.

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Red Pulp
TEM
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Red Pulp
TEM
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Red Pulp
SEM
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Red Pulp
SEM
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Sheathed Arteriole
SEM
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Sinusoidal Capillaries
SEM