Pathways Flashcards

1
Q

Pathways

A

There are MANY complex motor pathways. Two major ones are…

Cortico-Spinal (“Pyramidal”) Tracts

Ventro-Medial Tracts

  • These pathways are primarily Ipsi-lateral, (though some collaterals crossover in Brain Stem)
  • Primarily controls posture, movement of neck, shoulders & trunk, esp in co-ord with sensory activity
    (e. g. head/eye movement) & gross body movement (walking) – Note all involve both sides at once
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2
Q

Cortico-Spinal (“Pyramidal”) Tracts

A

mainly to Contra-Lateral Periphery, crossover at Pyramids of Medulla

  • Large Pyramid Cells
  • Fast, myelinated tracts,
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3
Q

Large Pyramid Cells

A

from Motor Cortex, synapse in Spinal Cord (onto Inter-Neurons or Motor Neurons)

  • Some synapse first at Red Nucleus (e.g. integrate w/Vestibular & Cerebellar info) then most to Cord
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4
Q

Red Nucleus

A

(e.g. integrate w/Vestibular & Cerebellar info)

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5
Q

Fast, myelinated tracts,

A

esp. for precise control of peripheral movements (e.g. hands, fingers, limbs, + face)

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6
Q

Ventro-Medial Tracts

A

Mainly for Bi-Lateral Midline control

  • Multiple sub-paths,
  • Many make multiple connections in Tectum, Vestibular Nucleus, Reticular Formation, then to Cord
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7
Q

Bi-Lateral Midline control

A

(both sides of central body & co-ord’d limbs)

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8
Q

Multiple sub-paths

A

originating from sub-cortex, most synapse in Spinal Cord, esp on Inter-Neurons

—Many make multiple connections in Tectum, Vestibular Nucleus, Reticular Formation, then to Cord

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