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The ileum follows the duodenum and jejunum and is separated from the cecum by the ileocecal valve (ICV). In humans, the ileum is about 2–4 m long, and the pH is usually between 7 and 8 (neutral or slightly basic). Ileum is derived from the Greek word εἰλεός (eileós), referring to a medical condition known as ileus. [citation needed]
The length of the small intestine can vary greatly, from as short as 3 metres (10 feet) to as long as 10.5 m (34 + 1 ⁄ 2 ft), also depending on the measuring technique used. [3] The typical length in a living person is 3–5 m (10– 16 + 1 ⁄ 2 ft). [4] [5] The length depends both on how tall the person is and how the length is measured. [3]
Jejunum: This is the midsection of the small intestine, connecting the duodenum to the ileum. It is about 2.5 m (8.2 ft) long and contains the circular folds also known as plicae circulares and villi that increase its surface area. Products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here.
The cecum receives chyme from the last part of the small intestine, the ileum, and connects to the ascending colon of the large intestine. At this junction there is a sphincter or valve, the ileocecal valve which slows the passage of chyme from the ileum, allowing further digestion. It is also the site of the appendix attachment. [33]
People with ileostomies must use an ostomy pouch to collect intestinal waste. People with ileostomies typically use an open-ended (referred to as a "drainable") one- or two-piece pouch that is secured at the lower end with a leakproof clip, or velcro fastener. The alternative is the closed-end pouch that must be thrown away when full.
The duodenum precedes the jejunum and ileum and is the shortest part of the small intestine. In human beings, the duodenum is a hollow jointed tube about 25–38 centimetres (10–15 inches) long connecting the stomach to the middle part of the small intestine. [4] [5] It begins with the duodenal bulb and ends at the suspensory muscle of ...
The division between the jejunum and ileum is not anatomically distinct. [5] In adult humans, the small intestine is usually 6–7 m (20–23 ft) long (post mortem), about two-fifths of which (about 2.5 m (8.2 ft)) is the jejunum. [4]
The ileocecal sphincter at the junction of the small intestine (ileum) and the large intestine, which functions to limit the reflux of colonic contents back into the ileum. The sphincter of Oddi , or Glisson's sphincter, controlling secretions from the liver , pancreas and gall bladder into the duodenum .