Give an exception to the general rule of dual reciprocal innervation by the autonomic nervous system
What will be an ideal response?
Innervated blood vessels receive only sympathetic nerve fibers. Regulation of vessel caliber in innervated blood vessels (that is, promoting vasoconstriction or vasodilation) is accomplished by increasing or decreasing the firing rate above or below tone level, respectively, in these sympathetic fibers. The only blood vessels to receive both sympathetic and parasympathetic fibers are those supplying the penis and clitoris. The precise vascular control this dual innervation affords these organs is important in accomplishing erection.
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Fill in the blank(s) with correct word
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