Tunica media is the layer of the arteriole wall that can contain smooth muscle and can produce vasoconstriction.
The smooth (involuntary) muscle cells and elastic fibers that make up the tunica medium, or middle coat, are organized in roughly spiral layers. The tough tunica adventitia, also known as the outer coat, is a layer that serves as support. It is made primarily of collagen fibers.
The arterial wall's ability to support mechanical loads is also impacted by its elasticity. The etiology of atherosclerotic lesions is significantly influenced by the media's metabolic condition. Vascular SMCs, elastin, and collagen fibers are grouped in a highly ordered manner in the tunica media.
Muscular arteries typically have diameters between 0.1 and 10 millimeters. Muscular arteries are able to play a significant part in vasoconstriction due to their thick tunica media.
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