plural of sinus node

(anatomy) Synonym of sinoatrial node.

(medicine) any cardiac rhythm in which depolarization of the myocardium begins at the sinus node, characterised by the presence of correctly oriented P waves in an electrocardiogram

plural of sinus rhythm

plural of sinus venosus

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

(anatomy) Alternative spelling of piriform sinus.

(anatomy) Either of two large venous sinuses of the cranium that begin at the bony protuberance on the middle of the inner surface of the occipital bone at the intersection of its bony ridges and that terminate at the jugular foramen on either side to become the internal jugular vein.

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