Most Blood Vessels are Innervated by the Sympathetic Division Alone

Question

Most blood vessels are innervated by the sympathetic division alone.

Accepted Answer

Most blood vessels are innervated by the sympathetic division of the autonomic nervous system, which can cause vasoconstriction or vasodilation depending on the needs of the body. However, some blood vessels in certain organs and tissues (such as the penis and clitoris) are also innervated by the parasympathetic division, which can cause vasodilation.