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Across 2. suturing of a cut nerve 6. three membranes covering the spinal cord and brain 8. nerve endings that detect chemicals 9. surfical relief of tension on a nerve 10. dynamic equilibrium of the body's internal environment 13. inflammation of the brain 15. uncontrollable urge to set fires 16. major type of nerve in upper spine 17. complete or partial loss of muscle movement 18. skull 19. agents often used as sedatives

Down 1. nerve endings that are responsible for vision 3. localized dilation of the wall of a blood vessel 4. nerve cells that conduct impulses to or from the nervous system 5. comprises most of the weight of the brain 7. chronic weakness and fatigue, often following depression 11. any disease of the nerves 12. double vision 14. agents that relieve pain 17. cytoplasmic projection of a neuron that carries impulses away from the cell body