Reticulospinal tract

Reticulospinal tract

Infobox Brain
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Caption = Reticulospinal tract is 2b, in red, near center.


Caption2 =
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BrainInfoType = hier
BrainInfoNumber = 802
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DorlandsPre = t_15
DorlandsSuf = 12817131
The reticulospinal tract (or anterior reticulospinal tract) is an extrapyramidal motor tract which travels from the reticular formation.

Components

The sensory tract conveying information in the opposite direction is known as the "spinoreticular tract".

The tract is divided into two parts, the medial (or pontine) and lateral (or medullary) reticulospinal tracts (MRST and LRST).
* The MRST is caudal to the Superior Colliculus and is responsible for extensor muscles. The fibers of this tract arise from the caudal pontine reticular nucleus and the oral pontine reticular nucleus and project to the lamina VII and lamina VIII of the spinal cord (BrainInfo)

* The LRST is rostral to the Superior Colliculus and is responsible for the flexor muscles. The fibers of this tract arise from the medullary reticular formation, mostly from the gigantocellular nucleus, and descend the length of the spinal cord in the anterior part of the lateral column. The tract terminates in the gray spinal laminae (BrainInfo).

Clinical significance

If the superior colliculus is damaged, it is called decerebration and causes decerebate rigidity.

The reticulospinal tracts also provide a pathway by which the hypothalamus can control sympathetic thoracolumbar outflow and parasympathetic sacral outflow.

External links

* BrainInfo reticulospinal tract [http://braininfo.rprc.washington.edu/Scripts/hiercentraldirectory.aspx?ID=802] , pontine reticulospinal tract [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=975] , and medullary reticulospinal tract [http://braininfo.rprc.washington.edu/Scripts/ancilcentraldirectory.aspx?ID=972] .
* http://www.lib.mcg.edu/edu/eshuphysio/program/section8/8ch6/s8ch6_29.htm
* http://www.mona.uwi.edu/fpas/courses/physiology/neurophysiology/The%20Reticulospinal%20Pathway.htm


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Look at other dictionaries:

  • reticulospinal tract — re·tic·u·lo·spi·nal tract ri .tik yə lō .spī nəl n a tract of nerve fibers that originates in the reticular formation of the pons and medulla oblongata and descends to the spinal cord * * * reticulospinal tract, anterior tractus reticulospinalis… …   Medical dictionary

  • reticulospinal tract lateral — reticulospinal tract, medullary tractus bulboreticulospinalis …   Medical dictionary

  • reticulospinal tract medial — tractus pontoreticulospinalis …   Medical dictionary

  • reticulospinal tract ventral — tractus reticulospinalis anterior …   Medical dictionary

  • 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

  • reticulospinal — Pertaining to the r. tract. * * * re·tic·u·lo·spi·nal (rə tik″u lo spiґnəl) pertaining to a reticular formation and the spinal cord …   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

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

  • Lateral corticospinal tract — labeled in red at upper left. Latin tractus corticospinalis lateralis, fasciculus cerebrospinalis lateralis …   Wikipedia

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