tractus solitarius


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sol·i·tar·y tract

[TA]
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.

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
References in periodicals archive ?
The nucleus tractus solitarius (NTS) is a region in the brainstem that receives input from the cardiovascular, respiratory and GI systems, and from the taste buds.
Cannabinoid receptors of the CB1 type are present in the area postrema, nucleus tractus solitarius, and dorsal motor nucleus, which are key sites of emetogenic control in the brainstem.
At the brain stem level, all the afferent nerve fibers from the oral cavity involved in initiating or facilitating swallowing converge in the CPG, especially in the nucleus tractus solitarius along with cortical drive.
These abnormal CSF pressure gradients are thought to form clefts in the floor of the fourth ventricle and disrupt the descending tract of the trigeminal nerve, nucleus tractus solitarius and the nucleus ambiguous.
They are found in the area postrema, nucleus of the tractus solitarius, cerebral cortex, spinal cord, and visceral autonomic and sensory nerves.
Moreover, high concentrations of opioid receptors have been found in areas of the brain such as nucleus tractus solitarius which is known to be important in central blood pressure regulation [11].
Decrease in sympathetic tone by central action, norepinephrine inhibition pre-synaptically mediated and vagomimetic action at nucleus tractus solitarius by Clonidine is accountable for bradycardia.
2+], and protein kinase C play a role in angiotensin II-induced free radical production in nucleus tractus solitarius," Hypertension, vol.
Neuroplasticity in nucleus tractus solitarius neurons after episodic ozone exposure in infant primates.
The nucleus tractus solitarius is closely related to the PCRF.
Jarrott, "Neurochemical modulation of cardiovascular control in the nucleus tractus solitarius," Progress in Neurobiology, vol.

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