jejunum

Examples of jejunum in the following topics:

• Anatomy of the Small Intestine

  • The jejunum is the middle section of the small intestine.
  • The inner surface of the jejunum, its mucous membrane, is covered in projections called villi, which increase the surface area of tissue available to absorb nutrients from the gut contents.
  • The villi in the jejunum are much longer than in the duodenum or ileum.
  • The function of the ileum is mainly to absorb vitamin B12, bile salts, and any products of digestion that were not absorbed by the jejunum.
  • An illustration of the small intestine with the duodenum, jejunum, and ileum labeled.

• Histology of the Small Intestine

  • The jejunum and ileum do not have Brunner's glands in the submucosa, while the ileum has Peyer's patches in the mucosa, but the duodenum and jejunum do not.
  • They are aggregations of lymphoid tissue that are found in the lowest portion of the small intestine, which differentiate the ileum from the duodenum and jejunum.

• Development of Metabolism

  • This diagram indicates the ileum, jejunum, and duodenum.

• Absorption in the Small Intestine

  • Absorption of the majority of nutrients takes place in the jejunum, with the following notable exceptions: iron is absorbed in the duodenum; vitamin B12 and bile salts are absorbed in the terminal ileum; water and lipids are absorbed by passive diffusion throughout the small intestine; sodium bicarbonate is absorbed by active transport and glucose and amino acid co-transport; and fructose is absorbed by facilitated diffusion.

• Digestive System Development

  • The midgut is the lower duodenum, leading to the first two-thirds of the transverse colon, jejunum, ileum, cecum, appendix, ascending colon, and first two-thirds of the transverse colon.

• Pancreatic Cancer

  • This procedure involves removing the pancreatic head and the curve of the duodenum together, making a bypass for food from stomach to jejunum and attaching a loop of jejunum to the cystic duct to drain bile.

• Anatomy of the Digestive System

  • Jejunum: This is the midsection of the intestine, connecting the duodenum to the ileum.

• Abdominopelvic Regions

  • The umbilical region contains the umbilicus (navel), and many parts of the small intestine, such as part of the duodenum, the jejunum, and the illeum.

• Organs of the Digestive System

• The Peritoneum

  • Intraperitoneal organs include the stomach, the first five centimeters and the fourth part of the the duodenum, the jejunum, the ileum, the cecum, the appendix, the transverse colon, the sigmoid colon, and the upper third of the rectum.