small intestine

(redirected from Small intestines)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Small intestines: Large intestines

small in·tes·tine

[TA]
the portion of the digestive tube between the stomach and the cecum (beginning of the large intestine); it consists of three portions: duodenum, jejunum, and ileum; its primary function is the continued digestion of chyme and the absorption of nutrients into the lymphatic (fats) and portal venous system, through its mucosal surface, which is highly modified to provide surface area for this purpose.
Synonym(s): intestinum tenue [TA]

small intestine

n.
The narrow, winding, upper part of the intestine where digestion is completed and nutrients are absorbed by the blood. It extends from the pylorus to the cecum and consists of the duodenum, the jejunum, and the ileum. Also called small bowel.

small in·tes·tine

(smawl in-tes'tin) [TA]
The portion of the digestive tube between the stomach and the cecum or beginning of the large intestine; it consists of three portions: duodenum, jejunum, and ileum.

small intestine

The longest, but narrowest part of the intestine. The part in which digestion and absorption of food is performed. The small intestine extends from the outlet of the stomach (the PYLORUS) to the CAECUM at the start of the large intestine (COLON), and consists of the DUODENUM, the JEJUNUM and the ILEUM.

small intestine

a narrow tube, which in humans is over 7m long, linking the stomach to the caecum. It is divided into an anterior part, the duodenum (25 cm), a central part, the jejunum (5.6 m) and a posterior part, the ileum (125 cm). CHYME from the stomach stimulates secretion of PANCREATIC JUICE on passing into the duodenum. Bile is added from the liver and flows into the duodenum through the bile duct. The jejunum has a larger diameter than the duodenum and larger VILLI than the rest of the intestine; it is the main absorptive region.

Large amounts of MUCUS are produced by the glandular cells, and a number of enzymes including maltase, peptidases, sucrase, lactase, enterokinase and nucleotidases are also secreted. The enzymes are thought to be largely produced in the CRYPTS OF LIEBERKUHN. The secretions of the small intestine are collectively called the succus entericus. The entire intestinal lining in humans is replaced every 36 hours and is the main site of the absorption of food.

References in periodicals archive ?
They increase in number toward the distal region of the small intestine. [4]
Primitive glands appear in the small intestines at I.U.
They attach themselves by their mouths to the wall of the small intestine where they feed on blood.
lactis-derived lactose is active at the nearly neutral pH of the small intestine. (19), (20)
"Suppressing acid secretion is effective for protecting the stomach from damage caused by NSAIDs, but these drugs appear to be shifting the damage from the stomach to the small intestine, where the ulcers may be more dangerous and more difficult to treat," said Wallace.
Mathias, Specialist General Surgeon and Head of the Department of Surgery of Welcare Hospital points on an X-ray of the gastric balloon that he removed from a patient after it passed into her small intestine causing a blockage.
Stress decreased feed intake of broiler chickens (Bottje and Harrison, 1985), and the limited nutrients decreased protein synthesis in the small intestine, which subsequently resulted in lowered small intestinal weight (Dudley et al., 1998).
Tissues harvested on euthanasia included blood, lungs, and small intestine (ileum).
"We can access the upper end of the small intestines, because we have instruments long enough to go into it, but that only takes us so far because there are so many loops, and it's just technically not feasible to go any further.
The new drug uses an enteric coating--a substance which does not dissolve in the acid environment of the stomach but does dissolve in the alkaline environment of the small intestines, releasing the drug there.
A material derived from the small intestines of pigs is revolutionizing the treatment of many medical problems from chronic sores to urinary incontinence in women to hernias.
Whatever the body can't digest in the small intestines reaches the large intestines, where extra water is taken out.

Full browser ?