Muscular branches of perineal nerve

Branches of the perineal nerve supplying muscles in the perineum

Muscular branches of perineal nerve

The muscular branches of the perineal nerve are responsible for innervating several muscles in the perineum. These branches are part of the pudendal nerve, which is a major nerve of the pelvic region.

Diagram of the pudendal nerve and its branches

Anatomy

The perineal nerve is a branch of the pudendal nerve, which originates from the sacral plexus, specifically from the ventral rami of the second, third, and fourth sacral nerves (S2-S4). The perineal nerve itself divides into several branches, including muscular branches that supply the muscles of the perineum.

Course

The perineal nerve travels through the pudendal canal, also known as Alcock's canal, which is located in the lateral wall of the ischiorectal fossa. As it exits the canal, the perineal nerve divides into superficial and deep branches. The muscular branches arise from the deep branch of the perineal nerve.

Innervation

The muscular branches of the perineal nerve innervate the following muscles:

• Bulbospongiosus muscle
• Ischiocavernosus muscle
• Superficial transverse perineal muscle
• Deep transverse perineal muscle
• External urethral sphincter

These muscles play crucial roles in the function of the urogenital diaphragm and are involved in actions such as micturition, ejaculation, and sexual function.

Muscles of the male perineum

Function

The muscular branches of the perineal nerve are essential for the voluntary control of the muscles they innervate. These muscles contribute to the support of the pelvic organs and are involved in the control of urination and defecation. Additionally, they play a role in sexual function, including erection and ejaculation in males, and clitoral erection and contraction of the vaginal wall in females.

Clinical significance

Damage to the perineal nerve or its muscular branches can result in perineal pain, incontinence, or sexual dysfunction. Such damage may occur due to childbirth, pelvic surgery, or trauma. Understanding the anatomy and function of these branches is crucial for diagnosing and treating conditions related to perineal nerve dysfunction.

Related pages

• Pudendal nerve
• Perineum
• Sacral plexus
• Pelvic floor