�y��vlog

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.

The adventitia or outer coat is exceedingly tough.

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.

The external coat, tunica adventitia, is composed mainly of fine and closely woven bundles of white connective tissue, which chiefly run diagonally or obliquely around the vessel.

The adventitia of the large arteries is strong and firm, and is made up of interlacing fibroelastic tissue, of which some of the bundles are arranged longitudinally.