Neuro 53: Motor intro

Question 1

What 5 things are involved in mvmnt & what controls them

Answer 1

1. plan - cerebellum
2. start - basal ganglia
3. move - UMN & LMN
4. adjust/coordinate - involves sensory feedback - cerebellum
5. balance/posture - cerebellum
   * *all happen spontaneously

Question 2

UMN consist of

Answer 2

1. cortical motor areas
2. brainstem nuclei
   - deliver messages to the LMN

Question 3

LMN consist of

Answer 3

1. cranial nerve mn

2. spinal cord mn

Question 4

How does the cerebellum help coordinate mvmnt? What happens w/ damage

Answer 4

• influences mvmnt through the UMN
• controls utilization of the correct m. for the task
• controls sequence of muscle contraction
• makes adjustments along the way
• controls balance
• *damage –> ataxia = uncoordination, falling, vestibular sx

Question 5

How does the basal ganglia help w/ mvmnt?

Answer 5

• influences mvmnt through the UMN
  1. gets mvmnt started
  2. increases motor cortical activity