The outermost connective tissue covering of any organ, vessel, or other structure. For example, the connective tissue that surrounds an artery is called the adventitia because it is considered extraneous to the artery. "Adventitia" comes from the Latin "adventicius" meaning "foreign, strange, extraneous, coming from abroad [..]

(ad´´ven-tish´ua) The outermost epithelial layer of a visceral organ; also called serosa. afferent

Outer layer of an organ.

(n) an enveloping or covering membrane or layer of body tissue

The outermost covering of organs, Blood Vessels, and other such structures in the body.

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.

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. Synonyms: tunica adventitia, membrana adventitia. Origin: L. Adventicius, comi [..]

(anatomy,histology) The outermost layer of epithelial tissue encasing a visceral organ.