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Neuroscience (By Chapter) > Ch. 10: Descending Pathways > Flashcards

Ch. 10: Descending Pathways Flashcards

1
Q

Medial Activation System

A
  • axons in anterior columns
  • connected to LMN in ventral horn
  • 4 pathways
    1. medial corticospinal tract
    2. medial vestibulospinal tract
    3. lateral vestibulospinal tract
    4. reticulospinal tract
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2
Q

4 Pathways of Medial Activation System

A
  1. medial corticospinal tract
  2. medial vestibulospinal tract
  3. lateral vestibulospinal tract
  4. reticulospinal tract
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3
Q

Nonspecific Activation System

A
  • Some UMN control excitation of other UMN

- Prep for moving quickly and easier

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4
Q

Lateral Corticospinal Tract:

Axons

A

A-alpha

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5
Q

Lateral Corticospinal Tract:

Function

A
  • voluntary fine motor control of distal Mm
  • fractionated movement
  • (90% of fibers from precentral gyrus)
  • [director UMN-lateral]
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6
Q

Lateral Corticospinal Tract:

Neuron Pathway

A

1st Order: prefrontal gyrus of cortex (cross midline in medulla) to ventral horn
2nd Order: ventral horn to periphery

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7
Q

Medial Corticospinal Tract:

Axons

A

A-alpha

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8
Q

Medial Corticospinal Tract:

Function

A
  • voluntary control of proximal muscles
  • (10% of neurons from precentral gyrus that don’t cross midlines)
  • [director UMN-medial division]
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9
Q

Medial Corticospinal Tract:

Neuron Pathway

A

1st: precentral gyrus of cortex to ventral horn
2nd: ventral horn to periphery

(DOES NOT cross midline)

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10
Q

Rubrospinal Tract:

Function

A
  • pick stuff up against gravity
  • facilitate UE flexors
  • [helper UMN-lateral division]
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11
Q

Rubrospinal Tract:

Neuron Pathway

A
  • 1st: brainstem (cross midline) to ventral horn

- 2nd: ventral horn to periphery

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12
Q

Medial Vestibulospinal Tract:

Function

A
  • Proximal Mm against gravity
  • balance & equilibrium
  • [helper UMN-medial division extensors]
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13
Q

Medial Vestibulospinal Tract:

Neuron Pathway

A

1st: vestibular nucleus (cross midline in medulla) to ventral horn
2nd: ventral horn to periphery

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14
Q

Reticulospinal Tract:

Function

A
  • UE & LE extensors against gravity

- [helper UMN-medial division-extensors]

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15
Q

Reticulospinal Tract:

Neron Pathway

A

1st: reticular formation to ventral horn
2nd: ventral horn to periphery

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16
Q

Lateral Vestibulospinal Tract:

Function

A
  • trunk and LE extensors to hold up against gravity

- [helper UMN-medial division-extensors]

17
Q

Lateral Vestibulospinal Tract:

Neuron Pathway

A

1st: vestibular nucleus to ventral horn
2nd: ventral horn to periphery

Neuroscience (By Chapter) (21 decks)

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