Chapter: Human Nervous System and Sensory Organs : Spinal Cord and Spinal Nerves

Sensory Innervation of Pelvis and Perineum

External openings of genitals, bladder, and rectum are border areas between involun-tary smooth intestinal muscles and volun-tary striated muscles.

Sensory Innervation of Pelvis and Perineum

In addition to the sacral and coccygeal nerves, the following nerves participate: the ilioinguinal nerve and the genitofemoral nerve (C15), the iliohypogastric nerve (C16),the obturator nerve (C17), the posterior cu-taneous nerve of the thigh (C18), the inferior cluneal nerves (C19), and the medial cluneal nerves (C20).

External openings of genitals, bladder, and rectum are border areas between involun-tary smooth intestinal muscles and volun-tary striated muscles. Accordingly, auto-nomic and somatomotor fibers are here in-tertwined. The pudendal nerve contains, apart from sensory, somatomotor, and sym pathetic fibers, also parasympathetic fibers from the sacral spinal cord. Sympathetic fibers also originate as pelvic splanchnic nerves from the second to fourth sacral nerves.

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Human Nervous System and Sensory Organs : Spinal Cord and Spinal Nerves : Sensory Innervation of Pelvis and Perineum |