Inferior Hypogastric Plexus

The inferior hypogastric plexus is formed by the union of nerves from the superior hypogastric plexus, sacral splanchnic nerves, and pelvic splanchnic nerves (Figure 12-4A). The inferior hypogastric plexus is located diffusely around the lateral walls of the rectum, bladder, and vagina. The plexus contains ganglia in which both sympathetic and parasympathetic pre-ganglionic fibers synapse. Therefore, the inferior hypogastric plexus consists of preganglionic and postganglionic sympathetic and parasympathetic fibers, as well as visceral sensory fibers. The inferior hypogastric plexus gives rise to many other smaller plexuses that provide innervation to organs involved with urination, defecation, erection, ejaculation, and orgasm.

Gray ramus communicans

Pelvic splanchnic nerve

Sciatic nerve

Aorta

Sciatic nerve

Hypogastric

Inferior mesenteric ganglion

Sympathetic nerve ganglion

Superior hypogastric plexus

Hypogastric nn.

Sacral sympathetic trunk

Pudendal n.

Inferior hypogastric plexus

Inferior mesenteric ganglion

Aorta

Sympathetic nerve ganglion

Superior hypogastric plexus

Hypogastric nn.

Pudendal n.

Sacral sympathetic trunk

Inferior hypogastric plexus

Posterior scrotal nn

Dorsal n. of penis Perineal nn.

Pudendal canal

Pudendal n. and internal pudendal a. Gluteus maximus m. (cut)

Posterior scrotal nn

Dorsal n. of penis Perineal nn.

Pudendal canal

Pudendal n. and internal pudendal a. Gluteus maximus m. (cut)

Penis Nerve Pain Treatment

Sacrotuberous ligament (cut)

Inferior rectal nn.

Figure 12-4: A. Prevertebral and sacral plexuses. B. Innervation of the perineum.

Sacrotuberous ligament (cut)

Inferior rectal nn.

Figure 12-4: A. Prevertebral and sacral plexuses. B. Innervation of the perineum.

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