l, peripheral, and autonomic nervous system. The brain and spinal cord makes up central nervous system, the spinal and cranial nerves form the peripheral nervous system, and the autonomic nervous system is made from various glands and muscles.Central Nervous SystemThe brain and spinal cord forms the Central Nervous System. The spinal cord gathers information from the neurons and sends it to the brain, but not all nerve impulses get sent to the brain. Only a few impulses reach the brain, and an even smaller number reaches the part of the brain where they cause awareness. The brain and spinal cord is made up of gray and white matter, as well as the various nerve cells. The brain is divided into three parts: the forebrain, midbrain, and hindbrain.The forebrain is called the cerebrum, the largest and most developed part of the human brain. It is divided by the longitudinal sulcus, a deep crevice that separates the forebrain into the left and right cerebral hemispheres. Each hemispheres control the motor (movement) and sensory (sight, smell, hearing, taste, and touch) functions of the other side of the body. The two hemispheres are divided into four lobes: the frontal, parietal, occipital, and temporal lobe. The frontal lobe is involved with muscle control from head to toe. The parietal lobe obtains sensory information from the skin and muscles. The occipital lobe receives information from vision, and the temporal lobe controls speech. Although the four lobes do different jobs, they communicate with each other to allow the brain to coordinate a response. The cerebrum combines the mixtures of sight, sound, smell, and movement and sends the information to many body parts at once. The midbrain is an inch of nerve fibers underneath the forebrain, which receives messages from the ear, eyes, and cerebrum. The midbrain helps coordinate movement and muscle tone. It also controls eye movements and reflexes in the eyes, like making the pupils smaller ...
