What do a.m. and p.m. stand for?

middle colic vein

middle colic vein in Medicine

middle colic vein n.
A tributary of the superior mesenteric vein, accompanying the middle colic artery.

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