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Across 4. neuroglial cells that line the ventricles of the brain 7. part of nervous system that controls the viscera 8. fatty layers formed from certain neuroglia that surround axons, providing insulation 9. a neuroglial cell that supports neurons and phagocytizes 16. a nerve fiber. It conducts a nerve impulse away from the neuron cell body 21. the brain and spinal cord 23. a bundle of axons in the peripheral nervous system 24. specialized structures associated with the peripheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which are transmitted to the central nervous system 25. muscles or glands that effect changes in the body 26. process of a neuron that receives input from other neurons 27. nerve cells

Down 1. part of the nervous system outside the central nervous system 2. neuron processes taht bring sensory information into the CNS 3. a level reached when the neurons are depolarized sufficiently, approximately -55 millivolts 5. carry impulses from the CNS to effectors (muscles or glands) 6. the functional connection between the axon of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type 10. masses of neuron cell bodies, usually outside the central nervous system 11. the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane 12. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 13. 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 14. chemicals that axons secrete on effectors (muscles or glands) or other neurons. 15. a type of neuroglial cell that surrounds an axon of a peripheral neuron, forming the neurilemmal sheath and myelin 17. narrow gaps between Schwann cells 18. pain resulting from inflammation of a nerve or group of nerves 19. a type of neuroglial cell that forms myelin 20. portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend. 22. a type of neurological cell that connects neutrons to blood vessels