vasa vasorum

Medical Dictionary

vasa vasorum vasa va·so·rum (vā-sôr'əm, -zôr'-)
Small arteries that are distributed to the outer and middle coats of the larger blood vessels and to their corresponding veins.

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

any small blood vessel ramifying on the outside of a major artery or vein 
WordNet® 3.0, © 2006 by Princeton University.
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