Definition of adventitia in English:


Syllabification: ad·ven·ti·tia
Pronunciation: /ˌadvenˈtiSH(ē)ə


  • The outermost layer of the wall of a blood vessel.
    More example sentences
    • The outer layer of veins comprises the tunica adventitia.
    • The arteries were most susceptible, with bruising of the intima and adventitia and separation of the media from the vessel walls.
    • There is an intense inflammatory reaction concentrated primarily in the adventitia of this blood vessel with some extension into the tunica media.



More example sentences
  • Aneurysmal development is caused by weakness in the muscular tunica media and stretching of the tunica intima and adventitial layers.
  • The inclusions may also be found in the adventitial cells of blood vessels.
  • Intimai proliferation and adventitial thickening may further reduce the cross-sectional area of the pulmonary vascular bed.


late 19th century: from modern Latin (tunica) adventitia 'additional (sheath)'.

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