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Across 2. 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. 4. Chemicals that axons secrete on effectors or other neurons. 9. Portion of nerve that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend. 13. A nerve fiber. 19. Process of a neuron that receives input from other neurons. 20. Specialized structures associated with the perpheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which are transmitted to the central nervous system. 24. The brain and spinal cord. 26. Motor pathways of the peripheral nervous system that lead to the skin and skeletal muscle. 27. A type of neuroglial cell that surrounds and axon of a peripheral neuron, forming the neurilemmal sheath and myelin.

Down 1. Nerves that receive sensory stimuli, such as how something feels and if it is painful, smooth, rough, etc. 3. Part of the nervous system outside of the central nervous system. 5. A type of neuroglial cell that forms myelin. 6. Nerve cells. 7. Part of the nervous system that controls the viscera. 8. 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. 10. The gaps formed between myelin sheath cells long the axons 11. Neurogial cells that line the ventricles of the brain. 12. Fatty layer formed from certain neuroglia the surround axons, providing insulation. 14. A neuron conducting impulses outwards from the brain or spinal cord 15. Muscles or glands that effect changes in the body. 16. The difference in electrical charge between the inside and the outside of a undisturbed nerve cell membrane. 17. Specialized cells of the nervous system that produce myelin. 18. a membrane must be depolarized to initiate an action potential. 21. A type of neuroglial cell that cell that connects neurons to the blood vessels. 22. A neuroglia that supports neurons and phagocytizes. 23. Masses of neuron cell bodies, usually outside the central nervous system. 25. A bundle of axons in the peripheral nervous system.