The anal sphincters can be felt by an index finger inserted into the anal canal and rectum. Axillary Lymph Node Dissection Removal and analysis of the axillary lymph nodes is often a vital tool for the staging of breast cancers. The pecten merges with the skin of the anus. Cancer of the Anal Canal Bruce D. The rectum, about 15 cm long, widens below as the ampulla, which is very distensible.
The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small. Viscera; Organ/Part of Organ Location/Description Notes; anal canal: terminal end of the digestive tract: anal canal is continuous with the rectum above and opens at. Collectively the rectum and anal canal constitute the very terminal segment of the large intestine, and thus of the entire gastro-intestinal tract.