adventitia

American  

[ad-ven-tish-ee-uh, -tish-uh] / ˌæd vɛnˈtɪʃ i ə, -ˈtɪʃ ə /

noun

Anatomy.

1. the external covering of an organ or other structure, derived from connective tissue, especially the external covering of a blood vessel.

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adventitia British  

/ ˌædvɛnˈtɪʃɪə, -ˈtɪʃə /

noun

1. the outermost covering of an organ or part, esp the outer coat of a blood vessel

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Other Word Forms

• adventitial adjective

Etymology

Origin of adventitia

1875–80; < Latin adventīcia, neuter plural of adventīcius adventitious

Example Sentences

These mimic the layered structure of the native vascular wall, which, from inside out, is composed of the tunica intima, tunica media and tunica adventitia tissues.

From Science Daily • Jan. 13, 2024

As mentioned previously, the most superficial layer of the esophagus is called the adventitia, not the serosa.

From Textbooks • Jun. 19, 2013

In contrast to the stomach and intestines, the loose connective tissue of the adventitia is not covered by a fold of visceral peritoneum.

From Textbooks • Jun. 19, 2013

Instead of serosa, the mouth, pharynx, and esophagus have a dense sheath of collagen fibers called the adventitia.

From Textbooks • Jun. 19, 2013

The outermost is the tunica adventitia, composed of connective tissue; immediately internal to this is the yellow elastic coat; within this again the muscular coat, formed of involuntary.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" by Various