small intestine

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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 intestine

the longest part of the digestive tract, extending for about 7 m from the pylorus of the stomach to the iliocecal junction. It is divided into the duodenum, jejunum, and ileum. Decreasing in diameter from beginning to end, it is situated in the central and caudal part of the abdominal cavity, surrounded by large intestine. It functions in digestion and is the major organ of absorption of prepared food. Compare large intestine.
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Small intestine

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.

intestine

the part of the alimentary tract extending from the pyloric opening of the stomach to the anus. It is a musculomembranous tube lined with a secretory and/or absorptive mucosa, comprising the small intestine and large intestine; called also bowel and gut. See also intestinal tract.
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Distended and congested loops of intestine in a cow with intussusception. By permission from Blowey RW, Weaver AD, Diseases and Disorders of Cattle, Mosby, 1997

large intestine
small intestine

small

a lesser dimension.

small buffalo grass
panicumcoloratum.
small burr medic
medicagominima.
small colon
the terminal colon in the horse between the right dorsal colon and the rectum. Because of its small diameter it is a common site for obstruction by phytobezoars and similar bodies.
small colon impaction
subacute colic in horses characterized by a palpable mass in the midlevel right abdomen.
small-faced mallow
small-flowered buttercup
ranunculusparviflorus.
small-flowered Darling pea
swainsonabrachycarpa.
small-flowered mallow
small-flowered melilot
melilotusindica.
small golden tip
goodiamedicagenea.
small-headed rice-flower
pimeleamicrocephala.
small intestine
includes all of the intestine between the pylorus and the ileocecal valve; composed of the duodenum, jejunum and ileum. See also intestine, intestinal.
small intestine meridian points
acupuncture points on the small intestine meridian.
small-leaf poranthera
porantheramicrophylla.
small-leaved bluebush
small liver fluke
dicrocoeliumdendriticum.
small nuclear ribonucleoproteins
small passion flower
passiflorasuberosa.
small stomach worm
small strongyles
include Caballonema, Cyathostomum, Cylicocyclus, Cylicodontophorus, Cylicostephanus, Cylindropharynx, Gyalocephalus, Poteriostomum spp.
small yellow foxglove
lathyrussplendens.