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Across 1. the sequence of electrical changes that occurs in a portion of a nerve cell membrane that is exposed to a stimulus that exceeds the membrane's threshold 3. part of nervous system that controls the viscera 5. neurological cells that line the ventricles of the brain 11. a type of neurological cell that connects neutrons to blood vessels 14. neutron processes that bring sensory information to the CNS 15. the brain and nervous system 17. the functional connection between the axon of a neuron and the dendrite or cell body of another neuron membrane of another cell type 18. a neurological cells that supports neutrons and phagocytizes 19. specialized structures associated with the peripheral ends of sensory neutrons 20. nerve cells 21. a type of neurological cell that surrounds an axon of a pheripheral neuron, forming the neurilemmal sheath and myelin 22. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 23. a bundle of axons in the peripheral nervous system 24. pain resulting from inflamation of a nerve or a group of nerves 25. fatty layers formed from certain neuroglia that surrounds axons, providing insulation 26. portion of nerve cell that includes a cytoplasmic mass and a nucleus, and form which nerve fibers extend

Down 1. a nerve fiber that conducts a nerve impulse away from the neutron cell body 2. part of the nervous system outside the central nervous system 4. process of a neutron that recieves input from other neutrons 6. carry impulses from the CNS to effectors 7. a type of neurological cell that forms myelin 8. masses of neutron cell bodies, usually outside the central nervous system 9. chemicals that axons secrete on effectors or other neutrons 10. narrow gaps between Schwann cells 12. the level where neutrons are depolarized suffciently 13. muscles or glands that effect changes in the body 16. the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane