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The channels in a lymph node crossed by a reticulum of cells and fibres and bounded by littoral cells; there are subcapsular, trabecular, and medullary sinus's.
Synonym: lymph sinus.
Maier's sinus, an infundibuliform depression on the internal surface of the lacrimal sac which receives the lacrimal canaliculi.
marginal sinuses of placenta, discontinuous venous lakes at the margin of the placenta.