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 (ăd′vĕn-tĭsh′ə, -vən-)
The membranous outer covering of an organ or a blood vessel.

[New Latin, from Latin adventīcius, foreign; see adventitious.]

ad′ven·ti′tial adj.


(ˌædvɛnˈtɪʃɪə; -ˈtɪʃə)
(Anatomy) 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]


(ˌæd vɛnˈtɪʃ i ə, -ˈtɪʃ ə)

n., pl. -ti•as.
the outer tissue layer of an organ, esp. that of a blood vessel.
[1875–80; < Latin adventīcia, neuter pl. of adventīcius adventitious]
ad`ven•ti′tial, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.adventitia - an enveloping or covering membrane or layer of body tissueadventitia - an enveloping or covering membrane or layer of body tissue
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
albuginea - whitish tunic
References in periodicals archive ?
For example, in a patient with a displaced proximal femoral fracture, the tunica adventitia of the femoral artery is not initially injured.
18) Although the best technique for donor ureter anastomosis remains unclear, the preservation of adventitia, fat, and blood supply to the ureter through delicate dissection, and use of short ureters, and fixation of the adventitia, fat, and blood supply of the ureter to the bladder wall to prevent kinking or twisting are methods explored to reduce complications from donor ureter anastomosis.
CIMT is defined as the area of tissue starting at the luminal intimal interface and the media adventitia interface of common carotid artery.
The temporal artery biopsy (TAB) revealed dense mixed inflammatory infiltrate consisting predominantly of lymphocytes and histiocytes involving the tunica adventitia, and the media with an extension into the intima and near complete destruction of external elastic lamina and focal disruption of internal elastic lamina (Figure 2).
These tumors arise from the intima and rarely extend to the adventitia to invade surrounding structures, so resection might result in complete removal.
Microscopically, the caudal vena cava had focally extensive, necrosuppurative, chronic-active phlebitis in the intima and adventitia (Figure 1C).
Using forceps to blunt dissect and remove adventitia surround the artery and vein can help this process.
CIMT was defined as distance between the leading edge of luminal echo to leading edge of the adventitia of the media.
It results from the accumulation of amyloid-p peptide deposits in the media and adventitia of small and medium sized vessels of the brain and leptomeninges.
8,33) CAD is thought to be the result of mucin-producing cells being haphazardly incorporated into the adventitia during arterial development.
1 The esophagus is surrounded by adventitia without a serosa.