The anal canal is extremely sensitive to touch from the anal verge to a level between 0.25 and 0.75 cm above the anal valves. Although localization of the stimulus around the circumference of the canal cannot be made, the approximate level of the stimulus can be gauged by the subject.

What nerves are around the anus?

Inferior anal nervesFromPudendal nerve (usually) sacral plexus (occasionally)InnervatesSphincter ani externus and sensory around the anusIdentifiersLatinNervi anales inferiores, nervi rectales inferiores, nervus haemorrhoidalis inferior

Where is the vagus nerve located in the anus?

Vagal innervation extends to the distal colon, while the PN has projections in the distribution of the rectum through the mid colon. This suggests a pattern of dual parasympathetic innervation in the left colon. Parasympathetic fibers regulate colorectal contractions via muscarinic receptors.