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Voluntary and Reflex Motor Physiology. The motor (efferent) division of the nervous system includes the somatic (voluntary) motor division and the autonomic. (involuntary) motor division. The somatic motor division involves voluntary or conscious movement of skeletal muscles.
The stretch reflex or myotatic reflex (sometimes myotactic reflex) is probably our body's most unrecognised and unappreciated defence mechanism. Forget about the immune system. When it comes to making it safely through the day, nothing comes close to the myotatic reflex.