Unformatted text preview: Brain The brain of the central nervous system is the organizing and processing center. It is the site of consciousness, sensation, memory, and intelligence. The brain receives impulses from the spinal cord and from 12 pairs of cranial nerves coming from and extending to the senses and to other organs. In addition, the brain initiates activities without environmental stimuli. Two major hemispheres, the left and the right hemispheres, make up the tissue of the brain. The outer portion of the brain consists of gray matter, while the inner portion is white matter. Three major portions of the brain are recognized: the hindbrain, the midbrain, and the forebrain. The hindbrain consists of the medulla, cerebellum, and pons. The medulla is the swelling at the tip of the brain that serves as the passageway for nerves extending to and from the brain. The of the brain that serves as the passageway for nerves extending to and from the brain....
View Full Document
- Fall '07
- Gray matter, Spinal Cord, brain initiates activities