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The inferior rectal nerves (inferior anal nerves, inferior hemorrhoidal nerve) usually branch from the pudendal nerve but occasionally arises directly from the sacral plexus; they cross the ischiorectal fossa along with the inferior rectal artery and veins, toward the anal canal and the lower end of the rectum, and is distributed to the sphincter ani externus (external anal sphincter, EAS) and ...
The pudendal nerve is the main nerve of the perineum. [1]: 274 It is a mixed (motor and sensory) nerve and also conveys sympathetic autonomic fibers.It carries sensation from the external genitalia of both sexes and the skin around the anus and perineum, as well as the motor supply to various pelvic muscles, including the male or female external urethral sphincter and the external anal sphincter.
In addition, sacral spinal nerves (S3, S4) innervate the muscles directly as well (in ~70% [5] of people). Sometimes (in ~40% [5] of people) the inferior rectal nerve innervates the levator ani muscles independently of the pudendal nerve.
The pudendal nerve that branches to supply the external anal sphincter also branches to the dorsal nerve of the clitoris and the dorsal nerve of the penis. [14] In addition to nerve endings, pleasure from anal intercourse may be aided by the close proximity between the anus and the prostate for males, and vagina, clitoral legs and anal area for ...
The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the anal canal.It is about 5 mm thick, and is formed by an aggregation of the smooth (involuntary) circular muscle fibers of the rectum.
This means the nerve signals are interrupted and are slower. This causes muscle contractions to be irregular and fewer, resulting in an increased colon transit time. [12] The feces stay in the colon for a longer period of time, meaning that more water is absorbed. This leads to harder stools and therefore increases the symptoms of constipation.
(This can happen with sex as well, she added: “Irritating the pelvic floor can cause spasms of these nerves, leading to severe pain in the pelvis, including the rectum, a condition called ...
The superficial branches of the perineal nerve become the posterior scrotal nerves in men, [3] and the posterior labial nerves in women. [1] The deep branch of the perineal nerve (also known as the "muscular" branch) travels to the muscles of the perineum. [1] Both of these are superficial to the dorsal nerve of the penis or the dorsal nerve of ...