Movement & the Motor System Jun 13, 2014. SENSORIMOTOR CONTROL. From Sensory to Motor. Sensory info -- guide motor system Somatosensory, vestibular, visual Book works from the TOP to BOTTOM Sensory “ up”, motor “ down” Here -- SIMPLE to COMPLEX . Organization. HIERARCHY
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Movement & the Motor SystemJun 13, 2014
When do you use your motor system?
What is actually “moving” in the “motor system” … ?
Sensory info spinal cord motor response
In response to foot contact, ankle rotation
Complex movement under control of the cortex and descending motor pathways
Most “movement” requires cortical control
Cortex to motor neurons (spinal cord) & brainstem
Directed movement, interaction with the environment
Dorsolateral corticospinal tract
Three other tracts…
1o cortex receives info from secondary motor cortex
When does the motor system need to be suppressed?
At any point in the hierarchy
Treatment – replace DA
Awakening the Frozen Addicts (BBC, 1993)
MPPP (synthetic opioid)
Ingestion of MPTP causes severe, immediate Parkinson’s symptoms…
…What is the mechanism?