tractus


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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.

tract

(trakt), [TA] Do not confuse this word with track.
1. An elongated area; a passage or pathway.
See also: fascicle. Synonym(s): tractus [TA]
2. An abnormal passage (for example, a fistula or sinus communicating with an abscess cavity).
[L. tractus, a drawing out]

tract

(trakt) [TA]
An elongated area, e.g., path, track, way.
See also: fascicle
Synonym(s): tractus.
[L. tractus, a drawing out]
References in periodicals archive ?
Potts, "Role of GABAergic neurones in the nucleus tractus solitarii in modulation of cardiovascular activity," Experimental Physiology, vol.
Vestibular nuclei and nucleus tractus solitarii send ascending neurons to prosencephalon.
The noradrenergic neurons (A2 group) of the nucleus tractus solitarius (NTS) that receives projections from carotid afferents and peripheral osmoreceptors have been highlighted among these regions [12,13].
Since vagal afferents are true bipolar cells, alterations in resting potential of the cell bodies will influence transmission of centrally directed action potentials to the nucleus tractus solitarius [1, 2].
Another indirect mechanism of peripheral cytokines transport is via vagal nerve stimulation of nucleus tractus solitarius (NTS) in brain stem and then preoptic area of hypothalamus [12, 86, 87] (Figure 1).
Opioid receptors modulate diverse types of calcium channels in the nucleus tractus solitarius of the rat.
321) as Acanthurus bahianus Castelnau 1855 is actually a distinct species, Acanthurus tractus Poey 1860.
Endothelial NO synthase activity in nucleus tractus solitarii contributes to hypertension in spontaneously hypertensive rats.
We are not only highly developed Jiving bodies with the five senses but also animals with the ability to think abstractly (Latin, ab, "from"; tractus, "pull," as in "tractor"--e.g., we pull from viewing many different concrete dogs one "abstract," general idea "dog," which applies to all dogs).
According to an assumption, it is thought that a vagal reflex which is named vagocervical or esophagocervical reflex and the center of which is the nucleus tractus solitarii is responsible of the clinical findings (10).
In fact, in the nucleus tractus solitarius of adult brain, it was shown that an antibody to the [G.sub.i] inhibited the effects of mGluRs [44].
For example, a study in rabbits showed that MSCs injected in the articulation could be later found in digestive tractus and thymus [130].