Opening of superior vena cava
Ostium venae cavae superioris
Definition
The superior vena cava returns the blood from the upper half of the body, and opens into the upper and back part of the atrium, the direction of its orifice (Opening of superior vena cava) being downward and forward. Its opening has no valve.
References
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
