Lymph node

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A lymph node is a secondary collections of lymphoid tissue other than the spleen and tonsils situated in the course of lymphatic vessels. Like the spleen it is a dense encapsulated lymphoid organ. Lymph nodes act as filters or traps for foreign particles and antigens. Presentation of antigens to lymphocytes by antigen-presenting cells occur in them. Migration of lymphocytes out of nodes is mediated by the gradient of the glycosphyngolipid, sphingosine 1-phosphate (S1P) which is at higher concentrations externally to lymph nodes and detected by a sphingosine 1-phosphate receptor 1 on the cell membrane of lymphocytes.

Lymph gland tissue. a Trabeculae b. Small artery c. Lymph paths. d. Lymph corpuscles. e. Capillary plexus.
Superfical lymph glands of head
Superfical lymph glands of arm
Deep lymph glands of thorax and abdomen
Superfical lymph glands of leg

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