Nervous+system+questions

=__**Nervous System**__=

= = 1. What are the two major divisions of the nervous system? 2. What are the three types of neurons? 3. What are the three parts of a neuron? 4. What is a nerve impulse and how does it spread (this requires a long answer). 5. Since neurons don't physically touch, how is an impulse transmitted from one neuron to the next? 6. What structures compose the central nervous system? 7. What are the two main functions of the spinal cord? 8. What are the four major parts of the brain and the general function of each?
 * neurons
 * neuroglia
 * sensory neurons
 * interneurons
 * motor neurons
 * cell body
 * dendrites
 * axon
 * a nerve impulse conveys information within the nervous system
 * the way the impulse spreads is
 * spinal cord
 * brain
 * provides a mean of communication between the brain and the peripheral nerves that leave the cord
 * the cerebrum-communicates with and coordinates the activites of the other parts of the brain
 * the diencephalon-helps maintain homeostasis and encircles the third ventricle
 * the cerebellum-receives sensory input from the eyes, ears, joints, and muscles about the present position of the body parts. Also receives motor output from the cerebral cortex
 * the brain stem-contains the midbrain, the pons, and the medulla oblongata