The membranous exterior covering of an organ or a blood vessel.
The outermost layer of epithelial structure encasing a visceral organ.
the membranous exterior covering of an organ or blood-vessel.
In structure, any membranous construction covering an organ yet not correctly belonging to it (entirely, membrana adventitia, adventitious membrane layer); specifically, the outermost for the three coats of a blood-vessel (completely, tunica adventitia, adventitious tunic), consisting of connective muscle.
an enveloping or addressing membrane or level of human body muscle