Search results
Results From The WOW.Com Content Network
The digestive tract continues as the jejunum which continues as the ileum. The jejunum, the midsection of the small intestine contains circular folds, flaps of doubled mucosal membrane which partially encircle and sometimes completely encircle the lumen of the intestine. These folds together with villi serve to increase the surface area of the ...
The chyme moves through the jejunum and the ileum, where digestion progresses, and the non-useful portion continues onward into the large intestine. The duodenum is protected by a thick layer of mucus and the neutralizing actions of the sodium bicarbonate and bile. At a pH of 7, the enzymes that were present from the stomach are no longer active.
The jejunum is specialized for the absorption through its lining by enterocytes: small nutrient particles which have been previously digested by enzymes in the duodenum. The main function of the ileum is to absorb vitamin B 12, bile salts, and whatever products of digestion that were not absorbed by the jejunum.
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.
It is divided into three parts: the duodenum, jejunum, and the ileum. The duodenum receives excretions from various organs such as the pancreas and spleen. The pancreas produces the hormone insulin, which helps regulate blood sugar. [4] [5] The second part is the jejunum, which is located in the middle of the small intestine. The final part of ...
The ileum, along with the jejunum, is suspended inside the mesentery, a peritoneal formation that carries the blood vessels supplying them (the superior mesenteric artery and vein), lymphatic vessels and nerve fibers. [3] There is no line of demarcation between the jejunum and the ileum. There are, however, subtle differences between the two: [3]
The jejunum is typically of larger diameter than the ileum. The villi of the jejunum look like long, finger-like projections, and are a histologically identifiable structure. While the length of the entire intestinal tract contains lymphoid tissue , only the ileum has abundant Peyer's patches , which are unencapsulated lymphoid nodules that ...
Anatomy figure: 37:03-08 at Human Anatomy Online, SUNY Downstate Medical Center—"Abdominal organs in situ." Anatomy figure: 37:06-09 at Human Anatomy Online, SUNY Downstate Medical Center—"The larger intestine." Anatomy figure: 39:05-09 at Human Anatomy Online, SUNY Downstate Medical Center—"The cecum with the distal portion of the ileum."