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Adventitia

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Adventitia

The outermost connective tissue covering of any organ, vessel, or other structure not covered by a serosa; instead, the covering is properly derived from without (i.e., from the surrounding connective tissue) and does not form an integral part of such organ or structure.

Synonym: tunica adventitia, membrana adventitia.

Origin: L. Adventicius, coming from abroad, foreign, fr. Ad, to _ venio, to come