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.

• Digestive System: Small and Large Intestines

  • The human small intestine, over 6 m long, is divided into three parts: the duodenum, the jejunum, and the ileum.
  • The second part of the small intestine is called the jejunum.
  • The bulk of chemical digestion and nutrient absorption occurs in the jejunum.

• 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.

• Campylobacter

  • The sites of tissue injury include the jejunum, the ileum, and the colon.

• 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.