Anatomy Rectum
The upper third lies intraperitoneally. Deep to the mucosa is the submucosa layer that supports the other layers of the rectum.
Rectal Cancer Vanderbilt Ingram Cancer Center
The rectum is an expandable organ for the temporary storage of feces.
Anatomy rectum. The rectum ends about 5 centimeters below the tip of the coccyx where it becomes the anal canal. The anus is the opening where the gastrointestinal tract ends and exits the body. Histology the mucosa forms the innermost layer of the rectum that is in contact with fecal matter.
The middle third retroperitoneally. The expansion of the rectal walls causes the stretch receptors within the walls to stimulate the urge to defecate. When the storage site becomes full the intrarectal pressure causes the anal canal walls to dilate and expand.
Tough tissue called fascia surrounds the anus and attaches it to nearby structures. The rectum is the last part of the large intestine and connects the sigmoid colon to the anal canal. In this article we will discuss the anatomy of the rectum its structure anatomical relationships and clinical relevance.
The peritoneum firmly attaches the rectum to the sacrum. The anus and anal canal. The rectum lies next to the sacrum and generally follows its curvature.
If the defecation process is delayed it may result in constipation. Next is the muscularis layer which contains layers of visceral smooth muscle. The rectum begins at the height of s2 s3 and ends at the perineum.
This results in the feces entering the canal. The rectum is the most distal segment of the large intestine and has an important role as a temporary store of faeces. The anorectal line separates the anus from the rectum.
It is continuous proximally with the sigmoid colon and terminates into the anal canal. Finally the serosa forms the. It is about 12 to 16 cm long und may be subdivided into three parts.
The anus starts at the bottom of the rectum the last portion of the colon large intestine.
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