Sensory decussation

Sensory decussation
Brain: Sensory decussation
Gray759.png
The sensory tract.
Latin decussatio lemnisci medialis
Gray's subject #187 777
NeuroNames hier-785

The sensory decussation or decussation of the lemniscus is a decussation or cross over of axons from the gracile nucleus and cuneate nucleus. The fibres of this decussation are called the internal arcuate fibres and are found at the superior aspect of the closed medulla superior to the motor decussation. It is part of the second neuron in the Posterior column-medial lemniscus pathway.

Additional images

  • Deep dissection of brain-stem. Ventral view.

  • Superior terminations of the posterior fasciculi of the medulla spinalis.

  • Transverse section passing through the sensory decussation.

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

v · d · eHuman brain: rhombencephalon, myelencephalon: medulla (TA A14.1.04, GA 9.767)
Dorsal
Surface
Grey: other
White: Sensory/ascending
White: Motor/descending
Ventral
White: Motor/descending
Surface
Anterior median fissure · Anterolateral sulcus · Olive · Pyramid
Grey: Raphe/
reticular

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)
v · d · eBrain and spinal cord: neural tracts and fasciculi
Sensory/
ascending
Fast/lateral
Slow/medial
1° (Group C nerve fiber → Spinoreticular tract → Reticular formation) → 2° (MD of Thalamus) → 3° (Cingulate cortex)
Motor/
descending
Pyramidal
Cerebellar
Afferent
Efferent
Bidirectional:
Spinocerebellar
Unc. prop.

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)



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Look at other dictionaries:

  • sensory decussation — decussatio lemnisci medialis …   Medical dictionary

  • Decussation of pyramids — Brain: Decussation of pyramids Deep dissection of brain stem. Lateral view. ( pyramidal tract visible in red, and pyramidal decussation labeled at lower right.) Latin decussatio pyramidum Gray s …   Wikipedia

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  • Gracile nucleus — Brain: Gracile nucleus Section of the medulla oblongata at the level of the decussation of the Pyramids. Gracile nucleus is #8 …   Wikipedia

  • 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

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  • Cuneate nucleus — Brain: Cuneate nucleus Dissection of brain stem. Dorsal view. (Label for nucleus cuneatus is on left, third from the bottom.) …   Wikipedia

  • Posterior column-medial lemniscus pathway — Originating in peripheral sensory receptors, the posterior column medial lemniscus pathway transmits fine touch and conscious proprioceptive information to the brain. Latin via column …   Wikipedia

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