Autonomic Innervation of the Prostate: The prostatic plexus of the male is derived from the larger nerves of the anterior portion of the inferior hypogastric plexus and lies alongside the prostate gland. It supplies the prostate gland, the prostatic urethra and the ejaculatory duct. The prostatic plexus also gives rise to the cavernous nerves of the penis, which are mainly parasympathetic and responsible for relaxation of smooth muscle allowing blood to flow into cavernous spaces in the corpora of the penis resulting in erection. Sympathetic stimulation causes ejaculation and vasoconstriction resulting in remission of an erection.
An easy way to keep this straight is to remember that Parasympathetics = Point and Sympathetics = Shoot
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