the nurse educator is teaching a group of nursing students about the A & P of the nervous system. Which statement made a student indicates appropriate understanding of the content? 1)"The central nervous system consists of the brain and spinal cord only." 2) "The peripheral nervous system consists of the cranial nerves, the spinal nerves, and peripheral nerves." 3) "The brain is a network of nerve cells called axons." 4) "Gray matter consists of axons that are coated with myelin, wh...