Pudendal nerve

The penis is mainly supplied by the internal pudendal artery, and three major sets of veins, superficial, intermediate, and deep veins, drain it. Drug-induced changes in neurotransmitter action can affect local blood flow. Vascular supply, intrinsic smooth muscles of the penis, and adjacent striated muscles are controlled by nerves arising from the thoracolumbar sympathetic, the lumbosacral parasympathetic, and the lumbosacral somatic systems. The pudendal nerve is the major somatic pathway innervating the male genitalia. 

External urethral sphincter muscle probably has cholinergic and adrenergic autonomic innervation as well as cholinergic striated muscle innervation (Elbadawi and Schenk, 1974). This rhabdosphincter is unique when compared to other striated muscle in that it has a higher density of neural end-plates as well as blood vessel-independent neural plexuses. Efferent rhabdosphincter innervation is probably via the pudendal nerve while the lissosphincter efferents probably emanate from the pelvic plexus (Elbadawi and Schenk, 1974). 

In the same preparations, somatic denervation of the external urethral sphincter was obtained by cutting the pudendal nerves. The paravertebral muscles were care-... 

The penis is supplied by both somatic and autonomic nerves. The somatic dorsal nerves provide sensory innervation (as well as provide some degree of autonomic function) for the penile skin and glans, and approximately follow the course of the dorsal penile arteries, eventually becoming the pudendal nerve (after joining with other nerves) and entering the... 

The penis is innervated by autonomic and somatic nerves. The somatic component is controlled by the pudendal nerve, which is responsible for penile sensation and the contraction and relaxation of the bulbocavernosus and ischiocavernosus striated muscles. Blood flow during erection and detumescence is regulated via the cavernous nerves, consisting of sympathetic and parasympathetic nerve fibers, which merge to form these nerves in the pelvis. 

Lower urinary-tract function is under the control of the somatic and autonomic nervous system. The latter is comprised of the sympathetic and parasympathetic nervous systems. Sympathetic nerves originate in the thoracolumbar region of the spinal cord at TIO to LI. Parasympathetic nerves arise from the sacral area of the spinal cord at the level of S2 to S4. Somatic nerves from the sacral cord course through the pelvic plexus and the pudendal nerve to the external sphincter region. 

Wenzel BJ, Boggs JW, Gustafson KJ, Grill WM (2005) Detecting the onset of hyperreflexive bladder contractions from the electrical activity of the pudendal nerve. IEEE Trans. Neural Syst Rehabil Eng 13(3), Sep. 2005. 

By the pudendal nerve (from S2-3-4 roots and anterior division of the sacral plexus). 

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