Lecture 19: Voluntary Motion Flashcards
What cortical areas are associated with voluntary motion?
- Primary Motor Cortex
- Supplementary Motor Cortex
- Pre-Motor Cortex
- Parts of Pre-frontal Cortex
- Parietal cortex
Redundant Roles
What does the premotor cortex do?
- Receives sensory information required to move
- Determines the appropriate motion and intent of the motion (dorsal part)
Identifies goal and motion required to meet goal
What does the supplementary motor area of the supplementary motor cortex do?
Postural control
What is the pre-supplementary area of the supplementary motor cortex involved in?
Plans motor program required to make the action occur
What does the supplementary motor cortex?
- Postural Control
- Organize motor sequences
- Acquire specific motor skills (with cerebellum)
- Executive control (decision to switch actions/strategies)
What does the primary motor cortex do?
- Controls specific movements of the body to reach goal
- Fine motions have high representation
What does layer 4 of the primary cortex do?
Receives sensory input from muscles and joint proprioceptors
What does layer 5 of the primary motor cortex do?
- Output for corticopsinal tracts: axons will travel down spinal cord (UMN)
- If axons synpase with alpha motor neuorns, they are known as pre-motor neurons
What sets of neurons are found in each column of the primary motor cortex?
- Start motion
- Maintain motion as long as necessary
How are columns organized in the primary motor cortex?
Neighboring columns have similar motions
- Also agonist/antagonist columns are nearby each other
What is the visual pathway required for both reaching and grasping?
Dorsal visual pathway
How does the brain receive visual information required for reaching?
Visual information is relayed to specific areas of the parietal cortex:
- V6A
- PEc
- MIP
- VIP
What does the ventral intraparietal (VIP) area do?
What action is it involved in?
Creates a rough map of space around you and desired object
Reaching
Where does the VIP area send its information to?
F4 areas within in pre-motor cortex
What does F4 do?
How does it do it?
How does the F4 region create a detailed map of the space around you?
Create a detail map about the space around self.
Neurons in F4 are excited by proximity: more activity the closer the desired object is