Layer of blood vessels innervated by sympathetic vasomotor fibers.

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The tunica media is the middle layer of the blood vessel's wall and contains smooth muscle cells that regulate vessel diameter. These smooth muscle cells are innervated by sympathetic vasomotor fibers, which can cause vasoconstriction or vasodilation. The other layers listed (tunica intima, subendothelial layer, tunica externa, and vasa vasorum) are not directly innervated by sympathetic vasomotor fibers.

Layer of Blood Vessels Innervated by Sympathetic Vasomotor Fibers