Page 458 - Atlas of Histology with Functional Correlations

FIGURE 11.16 ■ Palatine tonsil. Stain: hematoxylin and eosin. Low
magnification.

Summary

IMMUNE SYSTEM

Protects organism against invading pathogens and has wide distribution

Contains aggregates of immune cells (lymphocytes) in nodules or lymphoid
organs
Major organs are subdivided into primary and secondary lymphoid organs
Primary lymph organs are bone marrow and thymus

Secondary lymph organs are the lymph nodes, tonsils, spleen, and mucosa-
associated lymphoid tissue (MALT)
MALT is in the digestive tract (GALT), respiratory tract (BALT), bone, and
Peyer patches

ORGANS OF IMMUNE SYSTEM: LYMPH

NODES, THYMUS, AND SPLEEN

Lymph Nodes

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