The outermost layer of a blood vessel, composed mainly of fibrous tissue. [ http://en.wikipedia.org/wiki/Tunica_externa_(vessels) https://www.worldcat.org/search?q=bn%3A0073040584 ]
Synonyms: adventitia externa tunica adventitia tunica adventitia of vessel
Term information
- UMLS:C0225342 (ncithesaurus:Tunica_Adventitia)
- NCIT:C33818
- null:http://linkedlifedata.com/resource/umls/id/C0225342
- null:http://en.wikipedia.org/wiki/Tunica_externa_(vessels)
- BTO:0002010
- null:http://www.snomedbrowser.com/Codes/Details/61066005
- EMAPA:36299
TODO - note terminological problems. WP says tunica external layer of blood vessel. FMA says tunica externa = adventitia, and is FMA adventitia covers other kinds of vessels. Here we opt for a lengthier name that attempts to disambiguate. There is no precise FMA equivalent, as FMA has tunica externa of arteries, veins, genital ducts etc as siblings
The outermost layer of a blood vessel, surrounding the tunica media. It is mainly composed of collagen. The collagen serves to anchor the blood vessel to nearby organs, giving it stability[Wikipedia:Tunica_externa_(vessels)].