sinus node n.
See sinoatrial node.
- Sinus of dura mater
sinus of dura mater n. Any of the various venous channels located in the dura mater and lined with epithelial cells. Also called cerebral sinus, dural sinus.
[sahy-nuh s uh v val-sal-vuh] /ˈsaɪ nəs əv vælˈsæl və/ noun, Anatomy. 1. any of the pouches of the aorta and the pulmonary artery opposite the flaps of the semilunar valves into which blood returning to the heart flows, closing the valves.
- Sinus of vena cava
sinus of vena cava n. The portion of the cavity of the right atrium of the heart that receives the blood from the venae cavae and is separated from the rest of the atrium by the terminal crest.
noun, Mathematics. 1. a curve described by the equation y = a sin x, the ordinate being proportional to the sine of the abscissa. noun 1. any of the irregular terminal blood vessels that replace capillaries in certain organs, such as the liver, heart, spleen, and pancreas 2. another name for sine curve adjective 3. […]