tract
[trakt]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.
Anatomy of the gallbladder and biliary tract. From Aspinall and Taylor-Robinson, 2002.
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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
tract
(trakt), [TA] Do not confuse this word with track.2. An abnormal passage (for example, a fistula or sinus communicating with an abscess cavity).
[L. tractus, a drawing out]
Farlex Partner Medical Dictionary © Farlex 2012
tract
(trăkt)n.
Anatomy
a. A system of organs and tissues that together perform a specialized function: the alimentary tract.
b. A bundle of nerve fibers having a common origin, termination, and function.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
tract
Anatomy1. A bundle of nerve fibers in the CNS. See Spinothalamic tract.
2. A tube through which a substance or gas flows. See Aerodigestive tract, Biliary tract, Gastrointestinal tract, Olfactory tract, Respiratory tract, Serpiginous tract, Urogenital.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
tract
(trakt) [TA][L. tractus, a drawing out]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
tract
1. An associated group of organs forming a pathway along which liquids, solids or gases are moved. Examples are the digestive tract, the urinary tract and the respiratory tract.
2. A bundle of myelinated nerve fibres with a common function.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
tract
a bundle of nerve fibres that may run within the CENTRAL NERVOUS SYSTEM or to the peripheral nervous system.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
tract
1. A bundle of nerve fibres (e.g. the optic tracts).
2. A system of organs serving the same function, e.g. the respiratory tract.
geniculocalcarine tract See optic radiations.
optic tract's Two cylindrical bands of nerve fibres carrying visual impulses. They run outward and backward from the posterolateral angle of the optic chiasma, then sweep laterally, encircling the hypothalamus posteriorly on their way to the lateral geniculate bodies. A few fibres end in the superior colliculi. See incongruous hemianopia; visual pathway.
geniculocalcarine tract See optic radiations.
optic tract's Two cylindrical bands of nerve fibres carrying visual impulses. They run outward and backward from the posterolateral angle of the optic chiasma, then sweep laterally, encircling the hypothalamus posteriorly on their way to the lateral geniculate bodies. A few fibres end in the superior colliculi. See incongruous hemianopia; visual pathway.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
tract
(trakt) [TA]1. Elongated area; passage or pathway.
2. Abnormal passage (e.g., a fistula or sinus communicating with an abscess cavity).
[L. tractus, a drawing out]
Medical Dictionary for the Dental Professions © Farlex 2012
Patient discussion about tract
Q. While in a conversation with anyone they have about a minute before I loose tract and intrest, Is this ADHD I always feel like I have to go full speed 24/7 and can never relax, sounds strange I know but it seems to be catching up with me.
A. not necessarily...i see that you are 31. those symptoms are new? if so- thee are other conditions that might cause them. hyperthyroid can get you in that state too. so it might be a good idea to go and get checked up.
Q. How to prevent getting a bladder infection? I am worried about getting another bladder infection like I just had now. I am during my second trimester. How can I avoid getting it again?
A. drink more cranberry juice,its 100% natural, and wont harm the baby in anyway.
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