<Ul> <Li> Tunica intima ( the thinnest layer ) : a single layer of simple squamous endothelial cells glued by a polysaccharide intercellular matrix , surrounded by a thin layer of subendothelial connective tissue interlaced with a number of circularly arranged elastic bands called the internal elastic lamina . </Li> <Li> Tunica media ( the thickest layer in arteries ) : circularly arranged elastic fiber , connective tissue , polysaccharide substances , the second and third layer are separated by another thick elastic band called external elastic lamina . The tunica media may ( especially in arteries ) be rich in vascular smooth muscle , which controls the caliber of the vessel . Veins do n't have the external elastic lamina , but only an internal one . </Li> <Li> Tunica adventitia : ( the thickest layer in veins ) entirely made of connective tissue . It also contains nerves that supply the vessel as well as nutrient capillaries ( vasa vasorum ) in the larger blood vessels . </Li> </Ul>
<Ul> <Li> Tunica intima ( the thinnest layer ) : a single layer of simple squamous endothelial cells glued by a polysaccharide intercellular matrix , surrounded by a thin layer of subendothelial connective tissue interlaced with a number of circularly arranged elastic bands called the internal elastic lamina . </Li> <Li> Tunica media ( the thickest layer in arteries ) : circularly arranged elastic fiber , connective tissue , polysaccharide substances , the second and third layer are separated by another thick elastic band called external elastic lamina . The tunica media may ( especially in arteries ) be rich in vascular smooth muscle , which controls the caliber of the vessel . Veins do n't have the external elastic lamina , but only an internal one . </Li> <Li> Tunica adventitia : ( the thickest layer in veins ) entirely made of connective tissue . It also contains nerves that supply the vessel as well as nutrient capillaries ( vasa vasorum ) in the larger blood vessels . </Li> </Ul>
what is the muscular layer of a blood vessel
what is the muscular layer of a blood vessel
Tunica intima Tunica media Tunica adventitia
Tunica intima Tunica media Tunica adventitia