plural of sinus node

(anatomy) Synonym of sinoatrial node.

plural of sinus venosus

(zootomy) The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.

(anatomy) A large vein or passage (as the canal of Schlemm) for venous blood. / (anatomy) Alternative form of sinus venosus.

(anatomy) A venous sinus of the brain that is located along the line of junction of the falx cerebri and tentorium cerebelli, is formed by the junction of the great cerebral vein and the inferior sagittal sinus, and passes posteriorly to terminate in the confluence of sinuses.

(anatomy) Synonym of dural venous sinus.

(anatomy) Either of two venous sinuses on each side of the base of the brain.

(anatomy) A sinus on each side of the brain that is a continuation of the transverse sinus on the same side, follows an S-shaped course to the jugular foramen, and empties into the internal jugular vein.

(anatomy) A small cavity or pocket between the lateral walls of the pharynx on each side and the upper part of the larynx.