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The circular folds slow the passage of the partly digested food along the intestines, and afford an increased surface for absorption. [5] They are covered with small finger-like projections called villi (singular, villus). Each villus, in turn, is covered with microvilli. The microvilli absorb fats and nutrients from the chyme.
The circular muscle layer prevents food from travelling backward and the longitudinal layer shortens the tract. The thickness of the muscular layer varies in each part of the tract: In the colon, for example, the muscular layer is much thicker because the faeces are large and heavy and require more force to push along.
These folds are about 12 mm. in width and are composed of the circular muscle coat of the rectum. They are usually three in number; sometimes a fourth is found, and occasionally only two are present. One is situated near the commencement of the rectum, on the right side.
Labeled diagram of the small intestine and its surrounding structures The small intestine is divided into three structural parts. The duodenum is a short structure ranging from 20–25 cm (8–10 in) in length, and shaped like a "C". [ 12 ]
Rugae folds behind the anterior teeth in the hard palate of the mouth. In anatomy, rugae (sg.: ruga) are a series of ridges produced by folding of the wall of an organ. [1]In general, rugae are a biological feature found in many organisms, serving purposes such as increasing surface area, flexibility, or structural support.
[2] [4] It sometimes join the common hepatic duct at its anterior, posterior, or medial side [4] [3] (in the latter case by passing posteriorly around the common bile duct to join it from the other side). [2] It may spiral around the common hepatic duct before joining it. [4] Very rarely, the cystic duct opens into the duodenum. [3]
Skeletal structural formula of Vitamin B 12.Many organic molecules are too complicated to be specified by a molecular formula.. The structural formula of a chemical compound is a graphic representation of the molecular structure (determined by structural chemistry methods), showing how the atoms are connected to one another. [1]
The medial umbilical fold is an elevation of the peritoneum (on either side of the body) lining the inner surface of the lower anterior abdominal wall formed by the underlying medial umbilical ligament (the obliterated distal portion of the umbilical artery) which the peritoneum covers. [1]