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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.
Spinal reflexes include the stretch reflex, the Golgi tendon reflex, the crossed extensor reflex, and the withdrawal reflex. Stretch Reflex. The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. This reflex has the shortest latency of all spinal reflexes.