ANAT 216 Lecture 2: ANAT216 W1L3 Lecture 2 Lymphatic and Immune System 2 Organs
8 Mar 2017
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Anatomy 216 (reading material: chapter 23: pages 617-624) Lymphoid organs (lymph nodes, thymus, spleen): diffuse lymphatic tissue and lymphatic follicles or nodules, enclosed by a connective tissue capsule: complete capsule of dense connective tissue this characterizes an organ from an aggregation of follicles. Location vary on which tissue we"re talking about. Lymph nodes: lymph is filtered in these lymph nodes distributed along the lymphatic vessels, returned back to venous circulation: location: everywhere, but there are clusters at the surface (superficial) at groin, armpit, and neck region. Function: 2 primary functions: filter for lymph: phagocytic cells in the lymph node to clean up garbage, also cells that trap antigen to present to lymphocyte (activation, role in activating the immune response. Structure: shape and size: shaped like lima beans, could be 1mm-2. 5cm. Surrounded by a capsule of dense irregular ct with extensions that penetrate into the lymph node (trabeculae) Stroma (structural framework) of cortex is reticular ct.
