The orifice of the superior vena cava (fig. 2, a) at the upper and back part of the chamber.
The stimulus of the heart-beat probably starts at the juncture of the superior vena cava with the right auricle of the heart.
The two largest veins in the body, the superior vena cava and the inferior vena cava, open into the right auricle.
superior vena cava n.
A large vein formed by the union of the two brachiocephalic veins and the azygos vein that receives blood from the head, neck, upper limbs, and chest, and empties into the right atrium of the heart. Also called precava.
vena cava vena ca·va (kā'və)
n. pl. venae ca·vae (kā'vē)
Either of the two venae cavae, designated inferior and superior. Also called cava.
Plural venae cavae (vē'nē kā'vē)
Either of two large veins that carry blood with low levels of oxygen to the right atrium of the heart. ◇ The superior vena cava receives blood from the brain and upper limbs or forelimbs. ◇ The inferior vena cava drains blood from the trunk and lower limbs or hindlimbs and is the largest vein in the body.