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Across 2. a neuroglial cell that supports neurons and phagocytizes 4. a type of neuroglial cell that surrounds an axon of a peripheral neuron, forming the neurilemmal sheath and myelin (2 Words) 7. part of nervous system that control the viscera (3 Words) 9. A bundle of axons in the PNS 10. neuroglial cells that line the ventricles of the brain (2 Words) 11. bring sensory information to the CNS (3 Words) 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 (2 Words) 15. carry impulses from the CNS to effectors (3 Words) 17. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles (3 Words) 19. process of a neuron that receives input from other neurons 21. fatty layers formed from certain neuroglia that surround axons, providing insulation (2 Words) 22. Nerve Cells 24. A type of neuroglial cell that connects neurons to blood vessels 25. specialized cells of the nervous system that produce myelin, communicate between cells, maintain the ionic environment, and nurture the differentiation of neurons 26. narrow gaps between schwann cells (3 Words) 27. a type of neuroglial cell that forms myelin

Down 1. part of the nervous system outside the CNS (3 Words) 3. The brain and spinal cord (3 Words) 5. a nerve fiber that conducts a nerve impulse away from the neuron cell body 6. a lever hat depolarized neurons reach (2 Words) 8. masses of neuron cell bodies, usually outside the CNS 12. 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 CNS (2 Words) 14. Chemicals that axons secrete on effectors or other neurons 16. the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane (2 Words) 18. muscles or glands that effect changes in the body 20. the functional connection between the axon of a neuron and the dendrite or cell body of another neuron of the membrane of another cell type 23. portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend (2 Words)