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Across 3. bundles of axons 7. outer most layer of the meninges 10. have two process arising from the cell body 12. the potential difference between the region inside the membrane & the region outside the membrane 15. increases the chance that nerve impulse will occur 17. the junction between two communicating neurons 18. Provide insulating layers of myelin 19. Produce myelin in the PNS 20. The fatty lipoprotein 21. This system controls involuntary effectors 22. Motor functions that can be consciously controlled comprise what system

Down 1. Found between neurons and blood vessels 2. Connects the CNS to the rest of the body 3. masses of nerve cells 4. This carries nerve impulses from peripheral body parts into the brain or spinal cord. 5. rapid sequence of depolarization & repolarization 6. Narrow gaps between the schwann cells 8. These transmit information in the form of electrochemical changes 9. Consisting of the brain & spinal cord 11. Carrys impulses from the central nervous system to responsives structures called what? 13. lessens the chance that a nerve impulse will occur 14. receives electrochemical messages 16. Found in the PNS and surround