descending tract

descending tract
any bundle of nerve fibers conveying impulses from the brain toward target nuclei at lower levels of the nervous system.

Medical dictionary. 2011.

Look at other dictionaries:

  • Descending colon — Front of abdomen, showing surface markings for liver, stomach, and great intestine. (Descending colon visible at center right, in blue.) …   Wikipedia

  • tract — An elongated area, e.g., path, track, way. SEE ALSO: fascicle. SYN: tractus. [L. tractus, a drawing out] alimentary t. SYN: digestive t.. anterior corticospinal t. uncrossed fibers forming a small bundle in the anterior funiculus of the …   Medical dictionary

  • descending — Running downward or toward the periphery. SYN: descendens. [L. de scendo, pp. scensus, to come down, fr. scando, to climb] * * * de·scend·ing dē .sen diŋ, di adj 1) moving or directed downward <descending infection from the kidney (Therapeutic …   Medical dictionary

  • descending urography — excretion urography, excretory urography, intravenous urography radiographic examination of the urinary tract after the intravenous injection of an opaque medium that is rapidly excreted in the urine …   Medical dictionary

  • Corticospinal tract — Pyramidal tract redirects here. This page refers to the nerve fibres underlying the pyramids. For the actual area of the brain, Pyramids, see Pyramid of medulla oblongata. Brain: Corticospinal tract Deep dissection of brain stem. Lateral view. (… …   Wikipedia

  • Corticobulbar tract — Brain: Corticobulbar tract Components and location of the corticobulbar tract. Latin tractus corticonuclearis NeuroNames …   Wikipedia

  • Tectospinal tract — Diagram showing possible connection of long descending fibers from higher centers with the motor cells of the ventral column through association fibers. ( Tectospinal fasciculus labeled at center right.) …   Wikipedia

  • Anterior corticospinal tract — seen in red at bottom center in figure (text tag found at upper left) …   Wikipedia

  • Dentatothalamic tract — Brain: Dentatothalamic tract Latin tractus dentatothalamicus NeuroNames hier 525 NeuroLex ID birnlex 1104 The dentatothalamic tract (or de …   Wikipedia

  • Dorsal spinocerebellar tract — Posterior spinocerebellar tract is labeled in blue at right …   Wikipedia

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