adventitia

[ad-ven-tish-ee-uh, -tish-uh]

ad·ven·ti·ti·a

[ad-ven-tish-ee-uh, -tish-uh]
noun Anatomy.
the external covering of an organ or other structure, derived from connective tissue, especially the external covering of a blood vessel.

Origin:
1875–80; < Latin adventīcia, neuter plural of adventīcius adventitious

ad·ven·ti·tial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Adventitia is always a great word to know.
So is extrinsic. Does it mean:
originating outside the anatomical limits of certain muscles or nerves
a glandular organ functioning in the secretion of bile and metabolic processes such as converting sugars located in the upper right abdominal cavity
Collins
World English Dictionary
adventitia (ˌædvɛnˈtɪʃɪə, -ˈtɪʃə)
 
n
the outermost covering of an organ or part, esp the outer coat of a blood vessel
 
[C19: New Latin, from the neuter plural of Latin adventīcius; see adventitious]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

adventitia ad·ven·ti·tia (ād'věn-tĭsh'ə, -vən-)
n.
The outermost membranous covering of an organ or structure, especially the outer coat of an 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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