The anatomy of the anus

Medical Publications, Oxford University Press; It lies in the anal triangle of perineum in between the right and left ischioanal fossa. Perianal Lesions The location of perianal lesions is described in relation to a clock as seen in the supine position , eg, 2 o'clock, 7 o'clock. Tough tissue called fascia surrounds the anus and attaches it to nearby structures. Links to PubMed are also available for Selected References. The congenital anomaly in which the anal canal fails to communicate with the exterior is known as imperforate anus.

The clitoral glans and shaft is usually more sensitive than the whole of the penis because the density of nerve endings is greater. It requires medical treatment. The anus is rich with sensory nerve endings: