FNS 37 Cerebral Cortex: Motor Functions

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Author:
zf2010
ID:
73078
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FNS 37 Cerebral Cortex: Motor Functions
Updated:
2011-03-15 13:29:09
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USUHS Cerebral Cortex Motor Functions
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FNS 37 Cerebral Cortex: Motor Functions
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  1. 1. What regions are responsible for motor decisions and motivations?
    2. What region do they influence?
    • 1. Association and Limbic Cortex
    • 2. Influence Premotor Cortical Areas
  2. 1. What regions are responsible for planning/organizing movement?
    2. What region do they influence?
    • 1. Premotor cortical areas (LPA, SMA)
    • 2. Influence primary motor cortex
  3. Which thalamic nuclei are involved in basal ganglia influence of the premotor areas?
    VA, VL
  4. Which thalamic nucleus is involved in cerebellar influence of the premotor and primary motor areas?
    VL
  5. Which primary motor cortex cells synapse directly in the spinal cord?
    Giant Betz cells - monosynaptic pathway
  6. What is the difference between direct and indirect motor pathways?
    Indirect pathways synapse on nuclei in the brainstem, which projects to the spinal cord
  7. Locations in spinal cord and targets of:

    1. Direct pathways
    2. Indirect pathways
    • 1. Lateral descending pathways - distal muscles
    • 2. Medial descending pathways - axial/proximal muscles
  8. Primary Motor Cortex:

    1. Function?
    2. Organization?
    3. Lesion symptoms?
    • 1. Voluntary Muscle Control
    • 2. Organized according to movement components
    • 3. Contralateral UMN paralysis (spastic)
  9. Lateral Premotor Area:

    1. Function?
    2. Location?
    3. Lesion symptoms?
    • 1. Plans/initates voluntary movements triggered by external sensory cues
    • 2. Ant. to precentral gyrus, lateral side
    • 3. Impairment in performing tasks in response to sensory cues
  10. Supplementary Motor Area:

    1. Function?
    2. Location?
    3. Lesion symptoms?
    • 1. Plans/initiates voluntary movements initiated by internal guidance
    • 2. Ant. to precentral gyrus, medial side
    • 3. General reduction of voluntary movements, difficulty in spontaneous speech
  11. Frontal Eye Fields:

    1. Function
    2. Location?
    3. Lesion symptoms?
    • 1. Voluntary/memory-guided eye movements to contralateral side
    • 2. Ant. to precentral gyrus, inf. to lateral premotor area
    • 3. Eyes directed to side of lesion
  12. What are the direct motor pathways?
    • Lateral Corticospinal Tract
    • Anterior Corticospinal Tract
    • Corticobulbar Tract
  13. What are the indirect motor pathways?
    • Corticorubral Pathway
    • Corticoreticular Pathways
  14. Lateral Corticospinal Tract:

    1. Origin?
    2. Decussation?
    3. Target?
    • 1. Motor and sensory areas
    • 2. Crosses at spinomedullary junction
    • 3. Distal muscles
  15. Anterior Corticospinal Tract:

    1. Origin?
    2. Decussation?
    3. Target?
    • 1. Motor and sensory areas
    • 2. Crosses at segmental spinal levels
    • 3. Proximal/Axial muscles
  16. Corticobulbar Tract:

    1. Origin?
    2. Target?
    • 1. Head area of primary motor cortex
    • 2. Lower face musculature (crossed), other V, VII, XII bilateral
  17. Corticorubral Pathway:

    1. Origin?
    2. Termination?
    3. Activated pathway --> target?
    • 1. Upper limb area of primary motor cortex
    • 2. Ipsilateral red nucleus
    • 3. Rubrospinal pathway --> distal upper limb
  18. Corticoreticular Pathway:

    1. Origin?
    2. Termination?
    3. Activated pathway --> target?
    • 1. Lateral PMA, SMA
    • 2. Reticular Nuclei
    • 3. Reticulospinal pathway --> proximal muscle (fixation/stabilization)

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