Tunica media

Tunica media is the middle layer of an artery or vein. It is generally thicker in arteries, making them more resilient to the pressure of the blood that flows through them. The tunica media is made up of smooth muscle cells and elastic tissue.

Structure

The tunica media is the middle layer of the wall of a blood vessel, situated between the tunica intima that lines the inside of the vessel and the tunica adventitia that forms the outer layer of the vessel. It is composed of smooth muscle cells and elastic tissue. The smooth muscle allows the vessel to control its diameter, and hence the amount of blood flow. The elastic tissue allows the vessel to recoil after being stretched.

Function

The primary function of the tunica media is to help maintain blood pressure and circulation through the vessel. The smooth muscle in the tunica media can contract or relax, changing the diameter of the blood vessel. This allows the body to control how much blood flows through the vessel. The elastic tissue in the tunica media allows the vessel to stretch and recoil, accommodating changes in blood pressure.

Clinical significance

Diseases that affect the tunica media can lead to serious health problems. For example, atherosclerosis is a disease in which plaque builds up in the tunica media, narrowing the blood vessel and reducing blood flow. This can lead to heart attacks or strokes. Aneurysms, or bulges in the wall of a blood vessel, can also occur if the tunica media is weakened.

See also

• Artery
• Vein
• Blood vessel
• Atherosclerosis
• Aneurysm

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