Perineal Nerve - Podcast Version TeachMeAnatomy 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The perineal nerve (S2-4) is a nerve of the pelvic region and the largest terminal branch of the pudendal nerve. It supplies motor innervation to the perineal muscles as well as contributing to the sensory supply of the perineum. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Course The perineal nerve arises from the pudendal nerve within the pudendal canal – a passageway within in the lateral wall of the ischioanal fossa. After leaving the pudendal canal, the perineal nerve continues for another 2-3cm (acccompanied by the perineal artery) and then terminates by dividing into into two branches: Superficial perineal nerve – gives rise to posterior scrotal/labial sensory branches. Deep perineal nerve – supplies motor innervation to the perineal muscles and sensation to the vestibule and inferior vagina. By TeachMeSeries Ltd (2025) Fig 1The perineal nerve arises from the pudendal nerve within the pudendal canal. Pro Feature - Dissection Atlas Muscles of the female perineum Muscles of the female perineum You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Sensory Functions The perineal nerve supplies cutaneous sensation via its two main branches: Superficial perineal nerve – gives rise to posterior scrotal/labial sensory branches. In males, supplies the skin of the perineum and posterior scrotum In females, supplies the skin of the labia minora and majora Deep perineal nerve – supplies the sensation to the vestibule and inferior vagina in females. Adapted from work by Cancer Research UK [CC BY-SA 4.0] Fig 2The perineal nerve supplies sensation to the labia, vestibule and inferior vagina in females. Motor Functions The deep branch of the perineal nerve provides motor innervation to the perineal muscles: Bulbospongiosus Ischiocavernosus Superficial transverse perineal muscle External urethral sphincter Levator ani muscle Rate This Article