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