Location: in the walls of alimentary canal (tonsils, appendix and cecum, Peyer's patches), respiratory passages, and genitourinary tract, as well as in the other parts of the body.
Function: guard the body from and respond to entry of infectious organisms and toxins.
Composition: oval concentrations of lymphocytes contained in meshwork of reticular cells.
Composition:
Function: morphologic indication of lymphatic tissue response to antigen that represents a cascade of events that includes proliferation of lymphocytes, differentiation of plasma cell, and antibody production.