<P> Besides these, thousands of association nerves are also present in the body . </P> <P> Thus somatic nervous system consists of two parts: </P> <Ul> <Li> Spinal nerves: They are peripheral nerves that carry sensory information into and motor commands out of the spinal cord . </Li> <Li> Cranial nerves: They are the nerve fibers that carry information into and out of the brain stem . They include smell, vision, eye, eye muscles, mouth, taste, ear, neck, shoulders, and tongue . </Li> </Ul> <Li> Spinal nerves: They are peripheral nerves that carry sensory information into and motor commands out of the spinal cord . </Li>

Specific integrating center for voluntary skeletal muscle contraction