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  2. Lumen (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Lumen_(anatomy)

    The lumen is the space in the middle also known as the volume. Normal histology of the breast , with lumen annotated at bottom right [ 1 ] In biology , a lumen ( pl. : lumina ) is the inside space of a tubular structure, such as an artery or intestine. [ 2 ]

  3. Duodenum - Wikipedia

    en.wikipedia.org/wiki/Duodenum

    The duodenal bulb is a remnant of the mesoduodenum, a mesentery that suspends the organ from the posterior abdominal wall in fetal life. [10] The first part of the duodenum is mobile, and connected to the liver by the hepatoduodenal ligament of the lesser omentum. The first part of the duodenum ends at the corner, the superior duodenal flexure.

  4. Gastrointestinal wall - Wikipedia

    en.wikipedia.org/wiki/Gastrointestinal_wall

    From the inner cavity of the gut (the lumen) outwards, these are the mucosa, the submucosa, the muscular layer and the serosa or adventitia. The mucosa is the innermost layer of the gastrointestinal tract. It surrounds the lumen of the tract and comes into direct contact with digested food .

  5. Small intestine - Wikipedia

    en.wikipedia.org/wiki/Small_intestine

    The small intestine or small bowel is an organ in the gastrointestinal tract where most of the absorption of nutrients from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the pancreatic duct to aid in digestion.

  6. Intestinal villus - Wikipedia

    en.wikipedia.org/wiki/Intestinal_villus

    Intestinal villi (sg.: villus) are small, finger-like projections that extend into the lumen of the small intestine.Each villus is approximately 0.5–1.6 mm in length (in humans), and has many microvilli projecting from the enterocytes of its epithelium which collectively form the striated or brush border.

  7. Major duodenal papilla - Wikipedia

    en.wikipedia.org/wiki/Major_duodenal_papilla

    The junction between the foregut and midgut occurs directly below the major duodenal papilla. [3]: 274 The major duodenal papilla projects less than a centimetre into the lumen of the duodenum. [4] It appears rounded and is often covered by a fold on the uppermost side of the papilla; that is, the side which receives contents from the stomach. [4]

  8. Circular folds - Wikipedia

    en.wikipedia.org/wiki/Circular_folds

    The spaces between circular folds are smaller than the haustra of the colon, and, in contrast to haustra, circular folds reach around the whole circumference of the intestine. These differences can assist in distinguishing the small intestine from the colon on an abdominal x-ray.

  9. Intestinal gland - Wikipedia

    en.wikipedia.org/wiki/Intestinal_gland

    Intestinal glands are found in the epithelia of the small intestine, namely the duodenum, jejunum, and ileum, and in the large intestine (colon), where they are sometimes called colonic crypts. Intestinal glands of the small intestine contain a base of replicating stem cells , Paneth cells of the innate immune system , and goblet cells , which ...