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Medical Definition of Sinus lienis
1. An elongated venous channel, 12 to 40 um wide, lined by rod-shaped cells. Synonym: sinus lienis. Straight sinus, an unpaired dural venous sinus in the posterior part of the falx cerebri where it is attached to the tentorium cerebelli; it is formed anteriorly by the merging of the great cerebral vein with the inferior sagittal sinus, and passes horizontally and posteriorly to the confluence of sinuses. Synonym: sinus rectus, tentorial sinus. (05 Mar 2000)