Anatomy of the anus

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The rectum is the most distal segment of the large intestine , and has an important role as a temporary store of faeces. It is continuous proximally with the sigmoid colon, and terminates into the anal canal. In this article we will discuss the anatomy of the rectum — its structure, anatomical relationships, and clinical relevance. The rectum begins at the level of the S3 as a continuation of the sigmoid colon. It is macroscopically distinct from the colon, with an absence of taenia coli, haustra, and omental appendices. There are additionally three lateral flexures superior, intermediate and inferior , which are formed by transverse folds of the internal rectum wall.
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Anatomy of the Anus

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The Rectum - Position - Neurovascular Supply - TeachMeAnatomy

In this article, we shall look at the anatomy of the anal canal — its position, structure, relations and neurovascular supply. 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. The anal canal is surrounded by internal and external anal sphincters, which play a crucial role in the maintenance of faecal continence:. At the junction of the rectum and the anal canal, there is a muscular ring — known as the anorectal ring.
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The Rectum

The rectum is the final straight portion of the large intestine in humans and some other mammals , and the gut in others. The adult human rectum is about 12 centimetres 4. It terminates at the level of the anorectal ring the level of the puborectalis sling or the dentate line , again depending upon which definition is used.
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