adventitia
anatomy
Quick Summary
The adventitia is the outermost layer of a blood vessel, primarily composed of connective tissue. This tough layer serves as a supportive element for the vessel. In human physiology, arteries are muscular and elastic tubes that transport blood from the heart to the body's tissues. They have three layers: the tunica intima (innermost), the tunica media (middle), and the tunica adventitia (outermost). The adventitia is mainly made of collagen fibers.12
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