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Across 2. masses of neuron cell bodies, usually outside the central nervous system 5. fatty layers formed from certain neuroglia that surround axons, providing insulation 7. process of a neuron that recieves input from other neurons 11. a nerve fiber. it conducts a nerve impulse away from the neuron cell body 13. a bundle of axons in the peripheral nervous system 17. neuron processes that bring sensory information to the CNS 24. the brain and spinal cord 25. portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend 26. a type of neuroglial cell that connects neurons to blood vessels 27. nerve cells

Down 1. part of the nervous system outside the central nervous system 3. exposed to a stimulus that exceeds the membranes threshold 4. chemicals that axons secrete on effectors or other neurons 6. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 8. carry impulses from the CNS to effectors 9. 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 10. part of nervous system that controls the viscera 12. narrow gaps between Schwann cells 14. neuroglial cells line the ventricles of the brain 15. the difference in electrical charge between the inside and the outside of the an undisturbed nerve cell membrane 16. neurons are depolarized sufficiently 18. a type of neuroglial cell that forms myelin 19. wind tightly around axons 20. a neuroglial cell that supports neurons and phagocytizes 21. muscles or glands that effect changes in the body 22. fills spaces, produce myeling and provides structural framework 23. 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