How many nerve endings are in the rectum?

The rectum is densely innervated by nerves from the sacral spinal cord, specifically from the S2-S4 segments. The main nerve supply to the rectum is provided by the pudendal nerve, which arises from the sacral plexus. Other nerves that contribute to the innervation of the rectum include the pelvic splanchnic nerves and the inferior rectal nerves. These nerves provide sensory, motor, and autonomic innervation to the rectum, allowing it to function properly and respond to various stimuli.