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the anal canal is the final segment of the gastrointestinal tract. It has an important role in defecation and maintaining faecal continence. In this article, we shall look at the anatomy of the anal canal its position, structure, relations and neurovascular supply. 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 dual origin of the anal canal results in a dual blood supply, venous and lymphatic drainage, and nerve supply. 810 the superior two thirds of the anal canal is supplied by the superior rectal artery, a continuation of the inferior mesenteric artery, whereas the venous drainage of the superior anal canal flows into the superior rectal veins, tributaries of the inferior mesenteric vein. lymphatic drainage of the rectum and anal canal image posted on august 11, 2017 september 12, 2018 by thecomicalanatomist the ol answers (a) left common iliac artery (b) right common iliac artery (c) left internal illiac artery (d) right internal iliac artery (e) superior rectal artery (f) inferior rectal artery (g) internal pudendal artery (h) middle rectal artery. Below the dentate line) has a lymphatic drainage to the superficial inguinal lymph nodes bilaterally. Proximal to the dentate line, however, the anal canal drains its lymph primarily to the internal iliac lymph nodes bilaterally, and to a very limited extent, to the pre-aortic, inferior mesenteric lymph nodes on the posterior abdominal wall. The pectinate line (dentate line) is a line which divides the upper two thirds and lower third of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction. Most of the lymphatic vessels from the pelvis drain into groups of nodes associated with the iliac arteries and their branches (see figs. External iliac lymph nodes receive vessels from the inguinal nodes, external genitalia, vagina, and cervix they drain into the common iliac nodes.). enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube. Anal canal anatomy of the anal canal length 4 cm in adults.