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Contents

   



(Top)
 


1 Etymology  





2 Path  





3 Location through the brainstem  





4 See also  





5 Additional images  





6 References  





7 External links  














Medial lemniscus






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From Wikipedia, the free encyclopedia
 


Medial lemniscus
The sensory tract. (Medial lemniscus labeled at top right.)
Coronal section through mid-brain. ("e" is Portion of medial lemniscus, which runs to the lentiform nucleus and insula.『a’』is also the medial lemniscus.)
Details
Identifiers
Latinlemniscus medialis
NeuroLexIDbirnlex_887
TA98A14.1.04.111
A14.1.08.672
A14.1.06.207
TA25861
FMA83675
Anatomical terms of neuroanatomy

[edit on Wikidata]

Inneuroanatomy, the medial lemniscus, also known as Reil's bandorReil's ribbon (for German anatomist Johann Christian Reil), is a large ascending bundle of heavily myelinated axons that decussate (cross) in the brainstem, specifically in the medulla oblongata. The medial lemniscus is formed by the crossings of the internal arcuate fibers. The internal arcuate fibers are composed of axons of nucleus gracilis and nucleus cuneatus. The axons of the nucleus gracilis and nucleus cuneatus in the medial lemniscus have cell bodies that lie contralaterally.

The medial lemniscus is part of the dorsal column–medial lemniscus pathway, which ascends from the skin to the thalamus,[1] which is important for somatosensation from the skin and joints, therefore, lesion of the medial lemnisci causes an impairment of vibratory and touch-pressure sense.

Etymology[edit]

Lemniscus means "ribbon", so named because the medial lemniscus "spirals" or "turns" as it ascends.[citation needed]

Path[edit]

After neurons carrying proprioceptive or fine touch information synapse at the gracile and cuneate nuclei, axons from secondary neurons decussate at the level of the medulla and travel up the brainstem as the medial lemniscus on the contralateral (opposite) side. It is part of the posterior column-medial lemniscus pathway, which transmits touch, vibration sense, as well as the pathway for proprioception.[citation needed]

The medial lemniscus carries axons from most of the body and synapses in the ventral posterolateral nucleus of the thalamus, at the level of the mamillary bodies. Sensory axons transmitting information from the head and neck via the trigeminal nerve synapse at the ventral posteromedial nucleus of the thalamus.

Location through the brainstem[edit]

[2]

See also[edit]

Additional images[edit]

References[edit]

  1. ^ Kamali A, Kramer LA, Butler IJ, Hasan KM. Diffusion tensor tractography of the somatosensory system in the human brainstem: initial findings using high isotropic spatial resolution at 3.0 T. Eur Radiol. 2009 19:1480-8. doi:10.1007/s00330-009-1305-x.
  • ^ Purves et al, Neuroscience 5th edition, Sinauer Massachusetts, p. 198
  • External links[edit]


    Retrieved from "https://en.wikipedia.org/w/index.php?title=Medial_lemniscus&oldid=1217749969"

    Categories: 
    Brainstem
    Central nervous system pathways
    Somatosensory system
    Thalamus
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    This page was last edited on 7 April 2024, at 17:20 (UTC).

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