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tunica exterÂ´na an outer coat, such as the fibroelastic coat of a blood vessel. tunica interÂ´na an inner coat or layer. tunica inÂ´tima the innermost coat of a blood vessel; called also Bichat's tunic. tunica meÂ´dia the muscular middle coat of a blood vessel.
More Answers. The tunica externa, also known as the tunica adventitia, is the outermost layer of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and is supported by external elastic lamina.The collagen serves to anchor the blood vessel to nearby organs, giving it stability.unica externa or tunica adventitia is the outer most layer of the blood vessels. It is mostly composed of collagen which helps to anchor the blood vessel with nearly organ. The second or middle layer of blood vessel is tunica media.