Benign Anorectal Disorders pp Cite as. Rectum is a fixed terminal portion of the large intestine that serves as a reservoir. It is about 10—14 cm in length, and it is located between the sigmoid colon above and the anal canal below. It begins at the level of S3 vertebra and ends by becoming continuous with the anus which corresponds to the apex of the prostate or lower end of the vagina and is 2—3 cm in front of and a little below the tip of the coccyx.
The Anal Canal
The Anal Canal - Structure - Arterial Supply - TeachMeAnatomy
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. Except during defecation, the anal canal is collapsed by the internal and external anal sphincters to prevent the passage of faecal material. It is formed by the fusion of the internal anal sphincter, external anal sphincter and puborectalis muscle, and is palpable on digital rectal examination. These are joined at their inferior ends by anal valves.
Surgical Anatomy of Anal Canal and Rectum
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 the 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.
Anal canal , the terminal portion of the digestive tract , distinguished from the rectum because of the transition of its internal surface from a mucous membrane layer endodermal to one of skinlike tissue ectodermal. The anal canal is 2. The canal is divided into three areas: the upper part, with longitudinal folds called rectal columns; the lower portion, with internal and external constrictive muscles sphincters to control evacuation of feces ; and the anal opening itself. The anal canal connects with the rectum at the point where it passes through a muscular pelvic diaphragm.