Motor control
Components of a Somatic Sensory system
Detected by receptors Stimulus
Activates
First-order neuron in PNS
Second-order neuron in CNS
Third-order neuron in thalamus
Neuron in primary sensory cortex Conscious perception
of stimuli
Activates
Activates
Activates
Provides
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
1
Conscious decision is Made for specific
movements in Frontal lobes
Motor association areas
Cerebral
nuclei Cerebellum
2
Planning stage
A
A. Information is relayed from frontal lobes to motor association areas
B. These areas relay the information to cerebral nuclei and cerebellum
B B
Movement3
Motor association areas
Primary Motor cortex
Cerebral Nuclei
Cerebellum
Lower Motor neurons
Motor activity
Other extrapyramidal nuclei
1
1. As the movement begins MAA send instructions to PMA 2. Feedback from CN and Cerebellum modifies those commands 3. Extrapyramidal motor output directs involuntary adjustment in
position and muscle tone
2
2
3
