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Motor control
Components of a Somatic Sensory system
Provides
Conscious perception
of stimuli
Neuron in primary sensory cortex
Activates
Third-order neuron in thalamus
Activates
Second-order neuron in CNS
Activates
First-order neuron in PNS
Activates
Stimulus
Detected by receptors
1
Levels of Somatic Motor Control
Somatic motor control
(involves series of levels)
•Simple spinal and cranial reflexes at the base
•Complex voluntary motor patterns at the top
2
Planning stage
Conscious decision is
Made for specific
movements in
Frontal lobes
A
Motor
association areas
B
B
Cerebral
nuclei
Cerebellum
A. Information is relayed from frontal lobes to motor association
areas
B. These areas relay the information to cerebral nuclei and
cerebellum
3
1
Primary
Motor
cortex
Movement
Motor
association areas
2
2
Cerebellum
Cerebral
Nuclei
3
Other extrapyramidal
nuclei
1.
2.
3.
As the movement begins MAA send instructions to PMA
Feedback from CN and Cerebellum modifies those commands
Extrapyramidal motor output directs involuntary adjustment in
position and muscle tone
Lower
Motor
neurons
Motor activity