Down
| 2. | flexible column of vertebrae that protects the spinal cord |
| 5. | a phase of sleep during which dreams occur and the eyes make rapid movements under the closed eyelids (2 words) |
| 6. | central organ of the nervous system |
| 7. | the long, threadlike part of a neutron that transmits impulses away from the cell body |
| 8. | nerves that carry messages from the brain to the muscles resulting in actions (2 words) |
| 9. | part of the brain that coordinates movements and balance |
| 10. | 12 pairs of peripheral nerves that branch out from the brain (2 words) |
| 11. | gap between two neurons in a nerve pathway; junctions where two nerve cells almost touch |
| 13. | axons and dendrites (2 words) |
| 17. | control center of a cell |
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Across
| 1. | main part of the nerve cell (2 words) |
| 3. | controls eye muscles and adjusts ears to sound |
| 12. | brain and spinal cord (3 words) |
| 14. | message a nerve cell fires off due to a stimulus |
| 15. | tiny pulses of electricity that move along a nerve fiber (2 words) |
| 16. | nerves that spread to all parts of the body and are linked to the brain and spinal cord (2 words) |
| 18. | wrinkled part of the cerebrum made up of 10 to 14 billion neurons (2 words) |
| 19. | two halves of the cerebrum |
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