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

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