Rectum Anatomy

The expansion of the rectal walls causes the stretch receptors within the walls to stimulate the urge to defecate. The rectum is an expandable organ for the temporary storage of feces.

Sigmoid Colon Anatomy Rectum Large Intestine Png Clipart

The rectum is the last part of the large intestine.

Rectum anatomy. When the storage site becomes full the intrarectal pressure causes the anal canal walls to dilate and expand. The anus starts at the bottom of the rectum the last portion of the colon large intestine. The anus is the opening where the gastrointestinal tract ends and exits the body.

Inferior rectal artery branch of the internal pudendal artery. The venous blood drains through the correspondent veins into. Finally the serosa forms the.

In the context of mesenteric ischemia the upper rectum is sometimes referred to as sudaks point and is of. Histology the mucosa forms the innermost layer of the rectum that is in contact with fecal matter. The rectum ends about 5 centimeters below the tip of the coccyx where it becomes the anal canal.

This may be episodic over a persons lifetime. It is located within the pelvis and is the continuation of the sigmoid colon after the rectosigmoid junction and continues as the anal canal at the anorectal angle created by puborectalis. Rectum terminal segment of the digestive system in which feces accumulate just prior to discharge.

Deep to the mucosa is the submucosa layer that supports the other layers of the rectum. The rectum is supplied by the superior rectal artery branch of the inferior mesenteric artery middle rectal artery branch of the internal iliac artery and inferior rectal artery branch of the internal pudendal artery from the internal iliac artery. Tough tissue called fascia surrounds the anus and attaches it to nearby structures.

The anal canal is the most terminal part of the lower gi tractlarge intestine which lies between the anal verge anal orifice anus in the perineum below and the rectum above. Next is the muscularis layer which contains layers of visceral smooth muscle. The rectum receives arterial supply through three main arteries.

The rectum is continuous with the sigmoid colon and extends 13 to 15 cm 5 to 6 inches to the anus. The peritoneum firmly attaches the rectum to the sacrum. The rectum lies next to the sacrum and generally follows its curvature.

A muscular sheet called the pelvic diaphragm runs perpendicular to the juncture of the rectum and anal canal. Middle rectal artery branch of the internal iliac artery. The anus and anal canal.

The anorectal line separates the anus from the rectum. Ulcerative colitis one form of inflammatory bowel disease that causes ulcers that affect the rectum. Other diseases of the rectum include.

Superior rectal artery terminal continuation of the inferior mesenteric artery. The description in this topic is from below upwards as that is how this region is usually examined in clinical practice. If the defecation process is delayed it may result in constipation.

This results in the feces entering the canal.

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