Tract Details

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Author:
xitlali83
ID:
15887
Filename:
Tract Details
Updated:
2010-04-23 19:22:02
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Tract Details
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Description:
Origin, location, and termination
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  1. Lateral Corticospinal Tract
    • Origin- primary motor cortex, supplementary motor cortex
    • Pyramidal Cells in Corona radiate and narrow in the Internal Capsule
    • Goes through the basis pedunculi (midbrain), then
    • pontine nuclei (pons), then
    • through the pyramids in the medulla and cross over,
    • 75 to 90 % of the lateral corticospinal tract crosses over.
    • Termination- intermediate zone and ventral horn
  2. Ventral Corticospinal Tract
    • Origin- primary motor cortex, supplementary motor cortex
    • Pyramidal Cells in Corona radiate and narrow in the Internal Capsule,
    • goes through the basis pedunculi (midbrain), then
    • pontine nuclei (pons), then
    • through the pyramids (medulla)
    • continues down in the ventral column of spinal cord in white matter
    • Termination- ventral horn motor neurons, intermediate zone interneurons, collaterals may cross ( does not extend beyond thoracic spinal cord)
  3. Rubrospinal Tract
    • Origin- red nucleus (midbrain) crosses in the ventral tegmental,
    • descends in dorsolateral portion of midbrain:
    • it travels with corticospinal tract in the lateral column
    • Termination- lateral portions of intermediate zone and ventral horn
  4. Reticulospinal Tract
    • Origin- Medulla (medullary) or pons (pontine)
    • medullary reticulospinal tract travels in lateral column and the pontine reticulospinal tract travels in ventral column
    • Termination- medial intermediate zone and ventral horn.
  5. Vestibulospinal Tract
    • Origin- lateral vestibular nucleus and medial vestibular nucleus
    • some fibers from the medial vestibular nucleus cross at the medulla,
    • the lateral vestibular tract and the medial vestibular nucleus tract travel in ventral column
    • Termination- medial intermediate zone and ventral horn
  6. Tectospinal Tract
    • Origin- superior colliculus (midbrain),
    • fibers cross at midbrain, it
    • travels in ventral column of spinal cord
    • Termination- medial intermediate zone and ventral horn
  7. Dorsal column-medial lemniscal pathway (Ascending (sensory) Tracts
    • Origin- peripheral receptor
    • sensory neuron fibers travel in dorsal column white matter
    • sensory neuron synapses with brainstem neuron
    • brainstem neuron cross, then travels in medial lemniscus before synapsing with thalamic neuron
    • thalamic neuron projects to primary somatosensory cortical neuron
  8. Spinothalamic Tract (Ascending sensory Tracts)
    • Origin- peripheral receptor
    • sensory neuron synapses with dorsal horn neuron
    • dorsal horn axon cross then travels in spinothalamic tract before synapsing with thalamic neuron
    • thalamic neuron projects to primary somatosensory cortical neuron

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