tractus solitarius

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sol·i·tar·y tract

a slender, compact fiber bundle extending longitudinally through the posterolateral region of the medulla, surrounded by the nucleus of the solitary tract, below the obex decussating over the central canal, and descending over some distance into the upper cervical segments of the spinal cord. It is composed of primary sensory fibers that enter with the vagus, glossopharyngeal, and facial nerves, and in part convey information from stretch receptors and chemoreceptors in the walls of the cardiovascular, respiratory, and intestinal tracts; in rostral parts of the tract, impulses are generated by the receptor cells of the taste buds in the mucosa of the tongue. Its fibers are distributed to the nucleus of the solitary tract.
Farlex Partner Medical Dictionary © Farlex 2012

tractus solitarius

A thin tract of visceral sensory axons from cranial nerves CN VII, CN IX, and CN X. The tract runs longitudinally, alongside the solitary nucleus in the hindbrain. Axons from the tract, which carries information from mechanoreceptors and chemoreceptors, synapse in the adjacent nucleus.
See also: tractus
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Nitric oxide reduces blood pressure in the nucleus tractus solitarius: a real time electrochemical study.
Li et al., "Neurons in the nucleus tractus solitarius mediate the acupuncture analgesia in visceral pain rats," Autonomic Neuroscience: Basic and Clinical, vol.
"Neuroactive substances in the dorsal vagal complex of the medulla oblongata: nucleus of the tractus solitarius, area postrema, and dorsal motor nucleus of the vagus." Neurochemistry International 7.1 (1985): 191-211.
Antitussive agents suppress the cough reflex peripherally by suppressing the stimulation of sensory neurons in the airways or centrally at the level of the cough center in the nucleus tractus solitarius and its integrating network (Reynolds et al.
A number of afferent inputs from peripheral reflexes (i.e., arterialbaroreflexes, chemoreceptors, and hormonal mediators) can stimulate the rostral ventrolateral medulla and alter sympathetic nerve activity via neurons that terminate in the nucleus tractus solitarius of the medulla oblongata.
These include, but are not limited to, exciting spinoreticular pathways and dorsal column pathways to the PMRF, modulation of vestibulosympathetic pathways and vestibulocerebellar activation of the nucleus tractus solitarius, dorsal motor nucleus of vagus, and nucleus ambiguous.
However brainstem catecholaminergic regions projecting to the paraventricular nucleus showed a regionally selective and dose-dependent sensitivity to nicotine particularly the noradrenergic/adrenergic nucleus tractus solitarius [30].
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).
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].
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].
The increased afferent activity via the carotid sinus nerve projects to the nucleus tractus solitarius in the medulla, through which the primary relaying neurons activate the central pathway of the chemoreflex.
Opioid receptors modulate diverse types of calcium channels in the nucleus tractus solitarius of the rat.

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