The fibrous connective tissue layer of a blood vessel with collagen fibres is

Basically, each artery and vein consists of three layers: an inner lining of squamous endothelium, the tunica intima, a middle layer of smooth muscle and elastic fibres, the tunica media, and an external layer of fibrous connective tissue with collagen fibres, the tunica externa. Tunica albuginea is associated with the testis and the ovary.