El nervio rectal inferior (nervio anal inferior, nervio hemorroidal inferior) es un nervio de la región perineal. Proporciona inervación motora al esfínter anal externo y sensibilidad al canal anal inferior y a la piel perianal. 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 Trayecto El nervio rectal inferior se origina en el nervio pudendo, dentro del canal pudendo. Pasa medialmente, atravesando la pared medial del canal pudendo y la fosa isquioanal, acompañada por la arteria y la vena rectales inferiores. En el canal anal, el nervio rectal inferior se ramifica en fibras motoras que inervan el esfínter anal externo, así como en fibras sensitivas que inervan el canal anal y la piel perianal. By TeachMeSeries Ltd (2026) Fig. 1: el nervio rectal inferior se origina en el nervio pudendo dentro del canal pudendo. Inervación motora El nervio rectal inferior inerva con fibras motoras somáticas el esfínter anal externo. By TeachMeSeries Ltd (2026) Fig. 2: el nervio rectal inferior proporciona inervación motora somática al esfínter anal externo. Inervación sensitiva El nervio rectal inferior aporta inervación sensitiva a la mitad inferior del canal anal y la piel perianal. En las mujeres, también puede contribuir a la inervación de la pared vaginal inferior. Frequent questions What is the inferior rectal nerve? The inferior rectal nerve, also known as the inferior anal nerve or inferior haemorrhoidal nerve, is a nerve in the perineal region that supplies motor innervation to the external anal sphincter and sensory innervation to the lower anal canal and perianal skin. What does the inferior rectal nerve innervate? This nerve provides motor innervation to the external anal sphincter and sensory innervation to the inferior half of the anal canal and the surrounding perianal skin, playing a crucial role in anal function. Where does the inferior rectal nerve originate? The inferior rectal nerve arises from the pudendal nerve within the pudendal canal, traversing the medial wall of the pudendal canal and the ischioanal fossa alongside the inferior rectal vessels. What is the path of the inferior rectal nerve? The nerve follows a medial trajectory, passing through the pudendal canal and ischioanal fossa, before branching within the anal canal to provide both motor and sensory fibres. How does the inferior rectal nerve contribute to female anatomy? In females, the inferior rectal nerve may also assist in innervating the lower vaginal wall, highlighting its role beyond just the anal region. Rate This Article