The anal canal is the terminal segment of the large intestine between the rectum and anus, located below the level of the pelvic diaphragm. It is located within the anal triangle of perineum, between the right and left ischioanal fossa. As the final functional segment of the bowel, it functions to regulate release of excrement by two muscular sphincter complexes. The aperture at the terminal portion of the anal canal is known as the anus. the anal canal is located within the anal triangle of the perineum between the right and left ischioanal fossae. It is the final segment of the gastrointestinal tract, around 4cm in length. The canal begins as a continuation of the rectum, and passes inferoposteriorly to terminate at the anus. the rectum is the last part of the large intestine and connects the sigmoid colon to the anal canal. Watch the full version of this video to learn the anatomy of the rectum and anal canal https. It is located in a position between the rectum and the anus, under the level of the pelvic diaphragm. It is situated in the anal triangle of the perineum, between the left and right ischioanal fossa. The rectum initiates the terminal section of the large intestine at the level of the s3 vertebra, just after the sigmoid colon. Approximately 15 cm long, it is characterized by the cessation of the omental appendices and the absence of teniae coli and haustra. It is distally continuous with the anal canal as it protrudes through the pelvic diaphragmlevator ani.