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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.
Muscle action can be classified as being either voluntary or involuntary. Cardiac and smooth muscles contract without conscious thought and are termed involuntary, whereas the skeletal muscles contract upon command. Skeletal muscles in turn can be divided into fast and slow twitch fibers.