Also found in: Dictionary, Thesaurus, Encyclopedia.
the channels in a lymph node crossed by a reticulum of cells and fibers and bounded by littoral cells; there are subcapsular, trabecular, and medullary sinuses.
Synonym(s): lymph sinus
Endothelia-lined channels through which lymph flows inside lymph nodes. The walls of lymph sinuses are coated with T and B lymphocytes as well as phagocytic cells, all of which filter the passing lymph. Lymphocytes and macrophages move in and out of the lymph through the sinus walls.Synonym: lymph channel
See also: sinus