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Encyclopedia > Medial lemniscus
Brain: Medial lemniscus
The sensory tract. (Medial lemniscus labeled at center right.)
Coronal section through mid-brain. ("e" is Portion of medial lemniscus, which runs to the lentiform nucleus and insula.)
Latin lemniscus medialis
Gray's subject #188 803
NeuroNames ancil-736
Dorlands/Elsevier l_06/12483115

The medial lemniscus, also known as Reil's band or Reil's ribbon, is a pathway in the brainstem that carries sensory information from the gracile and cuneate nuclei to the thalamus. Image File history File links No higher resolution available. ... Image File history File links Gray710. ... The lentiform nucleus or lenticular nucleus describes the putamen and the globus pallidus within the basal ganglia. ... Insula is the Latin word for island. It has other meanings: A Roman building with several stories. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... NeuroNames is a system of nomenclature for the brain and related structures. ... Elseviers logo. ... The brain stem is the stalk of the brain below the cerebral hemispheres. ... Located in the medulla oblongata, the gracile nucleus is one of the dorsal column nuclei that participates in the sensation of fine touch and proprioception. ... Cuneate nucleus is a wedge-shaped nucleus in the medulla. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Contents

Path

After neurons carrying proprioceptive or touch information synapse at the gracile and cuneate nuclei, axons from secondary neurons decussate and travel up the brainstem as the medial lemniscus on the contralateral (opposite) side. It is part of the posterior column-medial lemniscus system, which transmits touch, vibration sense, as well as the pathway for proprioception. Illustration of the major elements in a prototypical synapse. ... The posterior column-medial lemniscus pathway (called the dorsal column in non-humans) is the sensory pathway responsible for transmitting discriminative sensation from the skin to the thalamus, and on to the cerebral cortex. ... The cerebellum is largely responsible for coordinating the unconscious aspects of proprioception. ...


The medial lemniscus axons from most of the body synapse at the ventral posterolateral nucleus of the thalamus. The axons transmitting information from the trigeminal nerve synapse at the ventral posteromedial nucleus of the thalamus. The ventral posterolateral nucleus (VPL) is a nucleus of the thalamus which projects to the postcentral gyrus and receives information from the medial lemniscus. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... The trigeminal nerve is the fifth (V) cranial nerve, and carries sensory information from most of the face, as well as motor supply to the muscles of mastication (the muscles enabling chewing), tensor tympani (in the middle ear), and other muscles in the floor of the mouth, such as the... The ventral posteromedial nucleus (VPM) is a nucleus of the thalamus which projects to the postcentral gyrus and receives the solitary tract. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


Location of the medial lemniscus through the brainstem

  • The cuneate and gracile nuclei reside at the closed (lower) medulla, so the lemniscus isn't formed at this level. Fibres from these nuclei will pass to the contralateral side of the brainstem, as the internal arcuate fibres.
  • At the open medulla (further up the brainstem), the medial lemniscus contains axons from the trigeminal nerve (which supplies the head region), as well as the arms and legs. It sits very close to the midline, at the same orientation of the midline, with head fibres more dorsal (closer to the back), towards the fourth ventricle.
  • By mid-pons, the medial lemniscus has rotated. Fibres from the head are medial, fibres from the leg are lateral.
  • The orientation in the midbrain is similar to that in the pons.

The medulla oblongata is the lower portion of the brainstem. ... Internal arcuate fibers are the axons of second-order neurons contained within the gracile and cuneate nuclei of the medulla oblongata. ... The trigeminal nerve is the fifth (V) cranial nerve, and carries sensory information from most of the face, as well as motor supply to the muscles of mastication (the muscles enabling chewing), tensor tympani (in the middle ear), and other muscles in the floor of the mouth, such as the... The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. ... Position of the pons in the human brain The pons (sometimes pons Varolii after Costanzo Varolio) is a knob on the brain stem. ... In biological anatomy, the mesencephalon (or midbrain) is the middle of three vesicles that arise from the neural tube that forms the brain of developing animals. ...

See also

  • Posterior column-medial lemniscus pathway

The posterior column-medial lemniscus pathway (called the dorsal column in non-humans) is the sensory pathway responsible for transmitting discriminative sensation from the skin to the thalamus, and on to the cerebral cortex. ...

Additional images

External links


  Results from FactBites:
 
IX. Neurology. 4b. The Mid-brain or Mesencephalon. Gray, Henry. 1918. Anatomy of the Human Body. (3293 words)
Thicker medially than laterally, it reaches from the oculomotor sulcus to the lateral sulcus, and extends from the upper surface of the pons to the subthalamic region; its medial part is traversed by the fibers of the oculomotor nerve as these stream forward to reach the oculomotor sulcus.
The principal gray masses of the tegmentum are the red nucleus and the interpeduncular ganglion; of its fibers the chief longitudinal tracts are the superior peduncle, the medial longitudinal fasciculus, and the lemniscus.
The medial lemniscus may be considered as the upward continuation of the posterior funiculus of the spinal cord and to convey conscious impulses of muscle sense and tactile discrimination.
  More results at FactBites »

 
 

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