Brain control of motor functions - CNS control of motor functions - Upper motor neurons (UMNs)

6 important questions on Brain control of motor functions - CNS control of motor functions - Upper motor neurons (UMNs)

Upper motor neurons (UMNs) are cell bodies found in which 3 brain structures:

  1. Brainstem
  2. primary motor cortex
  3. premotor cortex

What do UMNs in the primary motor cortex do?

initiate of voluntary movements
Enable someone to do skilled movements that require precise coordination across space and time (spatiotemporal)

What do UMNs in the premotor cortex do?
What do they allow UMNs in the PMC to do?

plans, and sets up actions before they happen so that UMNs in the primary motor cortex can execute and trigger actual muscle fibers to do the action planned.
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Name the 3 responsibilities that UMNs in the brainstem have

  1. regulating muscle tone
  2. orienting eyes, head and body
  3. critical for the control of posture

What does the anterior cinigulate gyrus govern the expression of?

the expression of emotions, esp facial musculature

What do the UMNs in the brocas initiate

speech initiation and production

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