What are the three layers in the wall of an artery?
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Circulatory system
Human circulatory system.
The wall of an artery is composed of three distinct layers, or coats:
- Tunica intima: The innermost layer, consisting of a lining, a fine network of connective tissue, and a layer of elastic fibers bound within a membrane pierced with openings.
- Tunica media: The middle coat, primarily composed of smooth muscle cells and elastic fibers arranged in roughly spiral layers.
- Tunica adventitia: The outermost coat, a tough, supportive layer consisting mainly of collagen fibers.1