The outermost covering of organs, blood vessels, and other such structures in the body.

Synonyms: Adventitious Tissues, Adventitial Tissue, Tunica Externa, Adventitia, Tunica Adventitia, Tissues, Adventitial, Adventitious Tissue, Adventitia, Tunica, Adventitial Tissues, Tissues, Adventitious, Tissue, Adventitious, Tissue, Adventitial