MICROANATOMY

Detailed explanation-1: -The tunica media or a middle layer composed of elastic and muscular tissue which regulates the internal diameter of the vessel.

Detailed explanation-2: -The middle layer, the tunica media, is primarily smooth muscle and is usually the thickest layer. It not only provides support for the vessel but also changes vessel diameter to regulate blood flow and blood pressure.

Detailed explanation-3: -The tunica media is composed chiefly of circumferentially arranged smooth muscle cells.

Detailed explanation-4: -arteries. The tunica media, or middle coat, is made up principally of smooth (involuntary) muscle cells and elastic fibres arranged in roughly spiral layers. The outermost coat, or tunica adventitia, is a tough layer consisting mainly of collagen fibres that act as a supportive element.

Detailed explanation-5: -The tunica media is the thickest layer of the arterial wall and is composed of elastic fibers, SMCs, fibroblasts and extracellular matrix.