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a longitudinal assemblage of tissues or organs, especially a number of anatomic structures arranged in series and serving a common function, such as the gastrointestinal or urinary tract; also used in reference to a bundle (or fasciculus) of nerve fibers having a common origin, function, and termination within the central nervous system.
alimentary tract alimentary canal.
biliary tract the organs, ducts, and other structures that participate in secretion (the liver), storage (the gallbladder), and delivery (hepatic and bile ducts) of bile into the duodenum. See illustration.
corticospinal t's two groups of nerve fibers (the anterior and lateral corticospinal tracts) that originate in the cerebral cortex and run through the spinal cord.
digestive tract alimentary canal.
dorsolateral tract a group of nerve fibers in the lateral funiculus of the spinal cord dorsal to the posterior column.
extrapyramidal tract extrapyramidal system.
gastrointestinal tract the stomach and intestine in continuity; see also digestive system.
iliotibial tract a thickened longitudinal band of fascia lata extending from the tensor muscle downward to the lateral condyle of the tibia.
intestinal tract see intestinal tract.
optic tract the nerve tract proceeding backward from the optic chiasm, around the cerebral peduncle, and dividing into a lateral and medial root, which end in the superior colliculus and lateral geniculate body, respectively.
pyramidal t's collections of motor nerve fibers arising in the brain and passing down through the spinal cord to motor cells in the anterior horns.
respiratory tract respiratory system.
urinary tract the organs and passageways concerned in the production and excretion of urine from the kidneys to the urinary meatus; see also urinary system.
uveal tract the vascular tunic of the eye, comprising the choroid, ciliary body, and iris.
Etymology: L, bilis, bile, tractus
the pathway for bile flow from the canaliculi in the liver to the opening of the bile duct into the duodenum.
biliary tractThe biliary plumbing system, which consists of the gallbladder, intrahepatic bile ducts, cystic duct—gallbladder to common bile duct—and common bile duct—liver and gallbladder to small intestine. Biliary tract obstruction usually leads to obstructive jaundice.
The organs and ducts through which bile travels on its way to the duodenum. These are the bile canaliculi, right and left hepatic ducts, common hepatic duct, gallbladder, cystic duct, bile duct, and hepatopancreatic ampulla.See: illustration; bile ducts; gallbladder; liver
See also: tract
pertaining to the bile, to the bile ducts, or to the gallbladder. See also bile duct.
removal in the bile of substances including drugs, toxins, hormones or pigments, or their breakdown products. These are delivered to the duodenum and removed in the feces.
one of the three forms of hepatic fibrosis; largely confined to the portal triads; see also bile duct fibrosis.
areas of hepatic fibrosis that physically resemble vascular infarcts but are related to damaged bile ducts.
interlobular biliary duct
see bile duct.
obstruction of biliary ducts may be intra- or extrahepatic, and intraluminal (calculi) or by external compression by tumor mass or cicatricial contraction, or more commonly in food animals by migrating ascarid larvae in the bile ducts or by cholangitis caused by Fasciola hepatica or Dichrocoelium dendriticum. Jaundice is the outstanding clinical sign of the condition. See also cholestasis.
see bile salt.
the organs, ducts, etc., participating in secretion (the liver), storage (the gallbladder, if present), and delivery (hepatic and bile ducts) of bile into the duodenum.