tunica externa

Medical Dictionary

tunica externa tunica ex·ter·na (ĭk-stûr'nə)
n.
The outer of two or more enveloping layers of any structure, especially the fibroelastic coat of a blood or lymph vessel.

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