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Across 1. Muscles or glands that effect changes in the body. 4. Conducts a nerve impulse away from the neuron cell body. 8. Chemicals that axons secrete on effectors. 14. Stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction. (2 Words) 20. Type of neuroglial cell that surrounds an axon of peripheral neurons. (2 Words) 22. Part of the nervouse system that controls the viscera. (3 Words) 24. Neuroglia cells that line the ventricles of the brain. (2 Words) 25. Motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles. (3 Words)

Down 2. Specialized structures associated with the peripheral ends of sensory neurons. (2 Words) 3. Part of the nervous system outside the central nervous system. (3 Words) 4. Sequence of electrical changes that occurs in a portion of a nerve cell membrane. (2 Words) 5. Carry impulses to effectors. (2 Words) 6. Differnce in electrical charge between inside and outside of an undisturbed nerve cell membrane. (2 Words) 7. A type of neuroglial cwell that forms myelin 9. Fatty layers formed from certian neuroglia that surrounds axons, providing insulation. (2 Words) 10. Functional connection between the axon of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type. 11. Provide physical support. 12. Support neurons. 13. The Brain and Spinal Cord. (3 Words) 15. Bring sensory Information. (2 Words) 16. A bundle of axons in the peripheral nervous system. 17. Masses of neuron cell bodies, usually outside the central nervous system. 18. Process of a neuron that recieves input from othe neurons. 19. A type of neuroglia cell that connects neurons to blood vessels. 21. Portion of nerve cells that include a cytoplasmic mass and a nucleus, and from which nerve fibers extend. (2 Words) 23. Nerve Cells.