There are three types of
layers, the tunica adventitia, media and intima.
layers, the tunica adventitia, media and intima.
The Outer Layer (Tunica Adventitia): It is made up of fibrous
tissues. This is a tough membrane covering the out-most part of the vessels and
it prevents outer distension of this vessels.
tissues. This is a tough membrane covering the out-most part of the vessels and
it prevents outer distension of this vessels.
The Middle Layer (Tunica Media): This is made up of plain
muscles and areolar tissues. It allows the expansion of vessels. Its size
reduces as the vessels narrow downwards. Tunica media of arteries are usually
thicker than that of vein
muscles and areolar tissues. It allows the expansion of vessels. Its size
reduces as the vessels narrow downwards. Tunica media of arteries are usually
thicker than that of vein
The Inner Layer (Tunica Intima): It is made up of
endothelium, specialized epithelium which is extension of inner layer of the
heart. It is smooth and allow for easy passage of blood.
endothelium, specialized epithelium which is extension of inner layer of the
heart. It is smooth and allow for easy passage of blood.