Medical Definition of Adventitia

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Adventitia: 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 or from outside." Other English words that stem from "advenire" include "adventure" and "avenue."

A related term is "adventititious" meaning "coming from an external source or occurring in an unusual place or manner." When a doctor or nurse listens to the chest or abdomen, adventitious sounds are those that are normally not heard coming from the chest or abdomen.

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Reviewed on 12/11/2018

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