Anatomy Rectum

The middle third retroperitoneally. Finally the serosa forms the.

Health Wellness Kaiser Permanente

In this article we will discuss the anatomy of the rectum its structure anatomical relationships and clinical relevance.

Anatomy rectum. Deep to the mucosa is the submucosa layer that supports the other layers of the rectum. The expansion of the rectal walls causes the stretch receptors within the walls to stimulate the urge to defecate. The anorectal line separates the anus from the rectum.

The anus starts at the bottom of the rectum the last portion of the colon large intestine. The rectum is the last part of the large intestine and connects the sigmoid colon to the anal canal. Tough tissue called fascia surrounds the anus and attaches it to nearby structures.

The anus is the opening where the gastrointestinal tract ends and exits the body. This results in the feces entering the canal. Histology the mucosa forms the innermost layer of the rectum that is in contact with fecal matter.

Next is the muscularis layer which contains layers of visceral smooth muscle. The anus and anal canal. If the defecation process is delayed it may result in constipation.

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. The peritoneum firmly attaches the rectum to the sacrum.

The rectum ends about 5 centimeters below the tip of the coccyx where it becomes the anal canal. The rectum lies next to the sacrum and generally follows its curvature. It is about 12 to 16 cm long und may be subdivided into three parts.

The upper third lies intraperitoneally. The rectum begins at the height of s2 s3 and ends at the perineum. The rectum is an expandable organ for the temporary storage of feces.

When the storage site becomes full the intrarectal pressure causes the anal canal walls to dilate and expand.

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