venous sinus

Medical Dictionary

venous sinus n.
A cavity at the caudal end of the embryonic cardiac tube in which veins from the intra- and extraembryonic circulatory arcs unite. In adults it develops into the sinuses of the venae cavae.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
venous sinus

noun
a wide channel containing blood; does not have the coating of an ordinary blood vessel 
WordNet® 3.0, © 2006 by Princeton University.
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