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

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