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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.
There are three primary types of muscles: skeletal muscles, smooth muscles and cardiac muscle. Skeletal muscles control movements of the body. Limb movement occurs when muscle fibers attached to the bones contract. Muscle contraction is a voluntary response controlled by neural functions that release the energy needed to cause the reaction.