Answer: The outter most covering of a structure or organ
Word Origin late 19th century: shortening of modern Latin tunica adventitia 'additional sheath'.
Scrabble Points: 14
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Medical Definition of adventitia : the outer layer that makes up a tubular organ or structure and especially a blood vessel is composed of collagenous and elastic fibers and is not covered with peritoneum — called also tunica adventitia tunica externa
The adventitia (advɛnˈtɪʃə) is the outer layer of fibrous connective tissue surrounding an organ. The outer layer of connective tissue that surrounds an artery or vein – the tunica externa is also called the tunica adventitia.
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The adventitia is the connective tissue beneath the panniculus carnosus muscle. It is loose irregular collagenous connective tissue composed of fibroblasts nerves blood vessels and other components. The adventitia not only connects the skin to the underlying skeletal muscle but also allows for flexibility of the skin.
The outermost connective tissue covering of any organ vessel or other structure (or part thereof) not covered by a serous coat (visceral peritoneum); instead the covering is properly derived from without (that is from the surrounding connective tissue) and does not form an integral part of such organ or structure.
The Adventitia A Dynamic Interface Containing Resident Progenitor Cells Mark W. Majesky Xiu Rong Dong Virginia Hoglund William M. Mahoney Jr. Guenter Daum Abstract—Conventional views of th...