The anus is the final part of the gastrointestinal tract, and directly continues from the rectum, passing through the pelvic floor. The top and bottom of the anus are surrounded by the internal See more

Sexuality
The anus has a relatively high concentration of nerve endings and can be an See more

• Muscles of the male perineum
• Muscles of the female perineum
• The posterior aspect of the rectum and anus exposed by … See more

Defecation
Intra-rectal pressure builds as the rectum fills with feces, pushing the feces against the walls of the See more

Anal fissures are tears in the external lining of the lining (mucosa) of the anus. These are exquisitely painful, with pain occurring after a motion is passed; other symptoms may include minor bleeding, discharge, or itch. Generally, fissures are due to injury to the … See more

• Anal bleaching
• Anal stage (Freudian psychosexual stage)
• Anococcygeal nerve
• See more