The outermost layer of a blood vessel, which is very thick, composed chiefly of collagen fibers, with scattered bands of elastic fibers is the

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The thick outer layer of a blood vessel, composed mainly of collagen fibers and scattered elastic fibers, is called the adventitia. The media contains smooth muscle cells, while the intima contains endothelial cells, and the external and internal elastic membranes are thin layers of elastic tissue found between the media and adventitia or media and intima, respectively.

The Outermost Layer of a Blood Vessel, Which Is Very