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1. Anatomy a system of organs, glands, or other tissues that has a particular function
2. a bundle of nerve fibres having the same function, origin, and termination


RC Church an anthem in some Masses
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in the central nervous system, any one of several groups of closely placed nerve fibers having a common morphological structure and common functions. Tracts are divided by function into associative tracts, which unite various sections of the cerebral cortex in the same hemisphere; commisural tracts, which connect both hemispheres and ensure their cooperative activity; and projection tracts, which unite the cerebral cortex with lower brain formations and, through them, with the periphery.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The duration of respiratory tract infection, times of infection and days of antibiotic application was compared between the two groups.
Notably, maternal vaccination reduced infant hospitalization for RSV lower respiratory tract infection by 44% during the first 90 days of life, when levels of transplacentally transferred neutralizing antibodies against RSV A and B were highest, with events occurring in 57 of 2,765 evaluable infants in the active treatment arm and in 53 of 1,430 controls.
All children presenting with clinical symptoms suggestive of acute lower respiratory tract infections were evaluated in detail in hospital on IPD basis.
The bacteriological diagnosis of LRTIs is usually challenging, as the specimens used for investigation are contaminated by the microbes which exist in the upper respiratory tract, as a result the need for sophisticated invasive procedures is required2.
(ii) Studies for the detection of HBoV in patients with or without diarrhea and respiratory tract symptoms.
[USA], Sep 10 ( ANI ): A recent study has linked respiratory tract infections in young children to an increased risk of asthma and worse lung function in later life.
A major cause of economic losses, BRD affects the lower respiratory tract / lungs (pneumonia) or upper respiratory tract (rhinitis, tracheitis, bronchitis).
Background: So far, many studies have shown that Human Bocavirus ( HBoV) is the main pathogen of the respiratory tract. Until now, there is no study that proves the association between HBoV and hepatitis.
Administering doses of a vitamin D supplement to patients can significantly mitigate their risk of developing acute respiratory tract infections, according to a recent study published by the BMJ.
to lower respiratory tract infections including pneumonia, he added.

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