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Asked by Wiki User. The function of the anal canal is to transmit and lubricate stool as it bypasses externally from the rectum. The rectum's function is to hold the feces until it is eliminated from the body through the anal canal and anus. The anal canal transmits and lubricates the feces as it passes from the rectum out of the body. The rectum, the final portion of the large intestine, becomes the anal canal. Function of Anal-pore. Anoscopy is the visual examination of the anal canal and lower rectum.

This line divides the anal canal into upper and lower parts, which differ in both structure and neurovascular supply.

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This is a result of their different embryological origins:. Inferior to the pectinate line, the anal canal is lined by non-keratinised stratified squamous epithelium known as the anal pecten.

It is a pale and smooth surface, which transitions at the level of the intersphincteric groove to true skin keratinised stratified squamous. The anal canal lies in close proximity to several other important structures in the pelvis and perineum:. Coccyx and sacrum.

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Bulb of the penis. As discussed above, the pectinate line divides the anal canal into two parts - which have a different arterial supply, venous drainage, innervation and lymphatic drainage.

Haemorrhoids are vascular cushions found within the anal canal of healthy individuals, which help with the maintenance faecal continence. If they become swollen and distended, they are referred to as pathological haemorrhoids. Pathological haemorrhoids are observed in people who suffer from constipationprolonged straining when defecating, or raised intra-abdominal pressure e.

g pregnancy, ascites. They can cause bleeding and itchiness, and depending on the severity, can be managed conservatively or surgically.

Anal Canal - 1 - Interior of Anal Canal

In this article, we shall look at the anatomy of the anal canal - its position, structure, relations and neurovascular supply. At the junction of the rectum and the anal canal, there is a muscular ring - known as the anorectal ring.

Above the anal valves are small pous which are referred to as anal sinuses - these contain glands that secrete mucus.

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The anal valves collectively form an irregular circle - known as the pectinate line or dentate line. Perineal body.

Bulb of the penis Perineal body. Neurovascular Supply and Lymphatics As discussed above, the pectinate line divides the anal canal into two parts - which have a different arterial supply, venous drainage, innervation and lymphatic drainage. Anastomosing brans from the middle rectal artery.

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Inferior rectal artery branch of the internal pudendal artery. Venous Drainage Superior rectal vein, which empties into the inferior mesenteric vein portal venous system.

Inferior rectal vein, which empties into the internal pudendal vein systemic venous system. Nerve Supply Visceral innervation via the inferior hypogastric plexus.

Anal canal function

Somatic innervation via the inferior rectal nerves brans of the pudendal nerve. Sensitive to pain, temperature, touch and pressure.

Lymphatics Internal iliac lymph nodes Superficial inguinal lymph nodes [start-clinical]. Once you've finished editing, click 'Submit for Review', and your changes will be reviewed by our team before publishing on the site.

Anal canal, the terminal portion of the digestive tract, distinguished from the rectum because of the transition of its internal surface from a mucous membrane layer (endodermal) to one of skinlike tissue (ectodermal). The anal canal is to 4 cm (1 to ins) in length; its diameter is narrower than that of the rectum to which it connects. The canal is divided into three areas: the upper Mar 08,   The anus is the last part of the digestive tract. It's made of the muscles that line your pelvis (pelvic floor muscles) and two other muscles called anal sphincters (internal and external). The Estimated Reading Time: 1 min Functions of large intestine, rectum and anal canal Absorption: The contents of the ileum passing through the ileocaecal valve into the caecum are in a liquid state even though most of the water is absorbed in the small intestine. Absorption of water by osmosis continues in the large intestine until the faeces has a semisolid embracingmothers.comted Reading Time: 7 mins

Cookies help us deliver the best experience to all our users. This includes the tissue that can be usually seen in more exposed areas of the skin, such as the lips. It serves to lubricate and transmit fecal matter as it passes from the rectum to outside the body. It helps regulate defecation and maintain continence voluntary control over fecal discharge. In rare cases, cancerous conditions may develop in the canal.

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These occur equally in both men and women. Although less common than colon cancer, which is hundred times more fatal, cancer disorders in the anal passage are the cause of around deaths every year in the U.

Fortunately, the canal can easily be accessed from outside.

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Naturally, problems or changes in the region can readily be detected. It is also easier for doctors to treat the region, particularly through surgery. Here are some useful Anal Canal images and illustrations that will help you know how this important organ looks like.

Oct 24,   The anal canal is surrounded by internal and external anal sphincters, which play a crucial role in the maintenance of faecal continence: Internal anal sphincter - surrounds the upper 2/ of the anal canal. It is formed from a thickening of the involuntary External anal sphincter - /5(54) The function of the anal canal is to transmit and lubricate stool as it bypasses externally from the rectum. What is the rectum's function? The rectum's function is to hold the feces until it is May 01,   Anal Canal Function It serves to lubricate and transmit fecal matter as it passes from the rectum to outside the body. It helps regulate defecation and maintain continence (voluntary control over fecal discharge)

You may use these Anal Canal photos for reference. Between the valves are small anal sinuses that open to lymph ducts and glands; these sometimes become abscessed and infected, especially in persons who have chronic diarrheaconstipationor diabetes mellitus.

The internal wall of the anal canal is first lined by moist, soft skin that lacks hair or glands; it then becomes a tough keratinized layer of skin containing hair and glands. The keratinized layer is continuous with the skin of the anal opening and external body.

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Both the upper and lower portions of the anal canal have circular and longitudinal muscle layers that allow expansion and contraction of the canal. The anal opening is keratinized skin that has several folds while contracted.

When open, the folds allow the skin to stretch without tearing. In the skin around the anal opening but not immediately adjacent to it are glands that give off perspiration. The lower anal canal and the anal opening are composed of two muscular constrictions that regulate fecal passage.

The internal sphincter is part of the inner surface of the canal; it is composed of concentric layers of circular muscle tissue and is not under voluntary control. The external sphincter is a layer of voluntary striated muscle encircling the outside wall of the anal canal and anal opening. One can cause it to expand and contract at will, except during the early years of life when it is not yet fully developed.

Nerves in the anal canal cause sphincter response and the sensation of pain. The lower part of the canal is very sensitive to heat, cold, cutting, and abrasion.

Waste products pass to the anal canal from the rectum.

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Nerve responses from the rectum cause the internal sphincter to relax while the external one contracts; shortly thereafter the external sphincter also relaxes and allows fecal discharge.

The pelvic diaphragm and longitudinal muscles draw the anus and rectum up over the passing feces so that they are not extruded prolapsed out of the anal opening with the feces. Numerous blood vessels surround the anal canal and may be subject to enlargement and rupture; this condition, commonly called a hemorrhoi or pile, may cause pain, bleeding, and projection of the vessels from the anus.

The anal canal marks the transition from the end of the alimentary canal to the exterior. Its prime function is to maintain continence by means of the internal embracingmothers.com by: 1 Sagittal T2WI shows the normal relationships of the anal canal. Anteriorly, the anal canal is related to the perineal body, the lower part of the vagina, and the anovaginal septum. The attachment to the perineal body is important for anal canal support. Posterior support is provided by the anococcygeal ligament Feb 2,   Function. The anal canal is an important part of the continence organ. It is surrounded by a muscular sphincter system which tightly closes the lumen. The internal anal sphincter is permanently contracted through the sympathetic tonus and relaxes under parasympathetic influence. The external anal sphincter surrounds


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