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Across 1. Specialized structures associated with peripheral ends of sensory neurons specific to detecting a particular sensation 3. Narrow gaps in between Schwann cells 5. If neurons are depolorized sufficiently, the membrane reaches a level called 6. Part of nervous system that controls the viscera 7. Neurological cells that line the ventricles of the brain 8. The difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane 9. Motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 12. The brain and spinal cord. 14. Chemicals that axons secrete on effectors (muscles or glands) or other neurons 15. Sensory nerve ending that responds to a stimulus in the internal or external environment of an organism 18. Carry nerve impulses away from central nervous system 19. A type of neurological cell that surrounds an axon of a peripheral neuron, forming the neurilemmal sheath and myelin 21. Specialized cells of the nervous system that produce myelin, communicate between cells, maintain the ionic environment, and nurture the differentiation of neurons 22. Masses of neuron cell bodies, usually outside the central nervous system 24. A neurological cell that supports neurons and phagocytizes 25. A type of neurological cell that connects neurons to blood vessels 26. A bundle of axons in the peripheral nervous system

Down 2. Part of the nervous system outside the central nervous system. 4. Type of neurological cell that forms Myelin 10. Muscles or glands that effect changes in the body 11. The sequence of electrical changes that occurs in a portion of a nerve cell membrane that is exposed to a stimulus that exceeds the membranes threshold 13. fatty layers formed from certain neuroglia that surrounds axons, providing insulation 14. Nerve cells 16. Process of a neuron that receives input from other neurons. 17. Portion of nerve cell that includes a cytoplasmic mass and a nucleus, and form which nerve fibers extend 20. 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 23. A nerve fiber. It conducts a nerve impulse away from the neuron cell body