Anus model rectum
Picture of the Anus
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The anus is formed partly from the surface layers of the body, including the skin, and partly from the intestine. The rectal lining consists of glistening red tissue.
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Description:This sphincter is controlled subconsciously by the autonomic nervous system. Infection by the human papillomavirus HPV can lead to warts in and around the anus. The musculus puborectalis forms a sling around the junction of the rectum with the anal canal and is maintained in a constant state of tension. The spastic pelvic floor syndrome. Near the termination of the sigmoid colon and the beginning of the rectum, the colonic taeniae spread out to form a wide external longitudinal muscle coat. This is the source of the term " anal-retentive " and the derived informal term "anal". 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 defecate.
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