At the rectal ampulla, a few longitudinal muscle fibers pass forward from the anterior rectal wall to the perineal body and urethra (rectourethral or puborectalis muscles). Genetic variations sometimes lead to rectal cancer, but lifestyle and environment can play a role in its development too. The last chamber, called the rectal ampulla, is the final reservoir for poop before it comes out.
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When the rectum is full, the receptors on the rectal walls work by sending signals to the brain to stimulate the sensation of needing to pass the stool. The lining of the rectum is relatively insensitive to pain, but the nerves from the anus. The rectal lining consists of glistening red tissue containing mucus glands—much like the rest of the intestinal lining.
Learn about rectal anatomy, its role in digestion, common conditions, and tips to maintain rectal health and prevent serious issues.
Two to three large crescentlike folds known as rectal valves are located in the rectal ampulla. The vascular and lymphatic networks, crucial for rectal cancer staging and hemorrhoidal disease, are detailed, alongside somatic and autonomic innervation critical to anorectal function. In this condition, the sphincter will relax. The rectal wall consists of five layers, starting from the lumen:
As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to pass feces, a process called defecation. When this chamber fills, nerve fibers that detect stretch in the rectal wall (stretch receptors). These valves are caused by an invagination, or infolding, of the circular muscle and. The mucosa, deep mucosa, submucosa, muscularis propria, and serosa that is covered by the peritoneum.
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