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Across 3. Fatty layers formed from certain neruoglia that surrounds axons, providing insulation 4. Masses of neuron cell bodies, usually outside the central nervous system 6. The difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane 7. A type of neuroglial cell that forms myelin 8. A bundle of axons in the peripheral nervous system 9. The part of the nervous system that integrates the information that it receives 11. carry nerve impulses from receptors or sense organs towards the central nervous system 13. carry nerve impulses away from the central nervous system to effectors 15. 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 16. A type of neuroligial cell that surrounds an axon ofa peripheral neuron, forming the neruilemmal sheath and myelin 18. the basic building blocks of the nervous system 19. Neuroligal cells tat line the ventricles of the brain 20. Chemicals that axons secrete on effectors or other neurons 24. specialized cells of the nervous system that produce myelin, communicate between cells, maintain the ionic environment, and nurture the differentiation of neruons 25. Portion of nerve cell that includes cytoplasmic mass and a nucleus and form which nerve fibers extend 26. The voluntary control of body movements

Down 1. A type of neuroglial cell that connects neurons to blood vessels 2. Consists of the nerves and ganglia outside of the brain and spinal cord 5. Acts as a control system functioning largely below the level of consciousness, and controls visceral functions 10. The gaps formed between the myelin sheaths generated by different cells 12. 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 14. Specialized structures associated with the peripheral end of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which transmitted to the central nervous system. 17. Branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body 21. Muscles or glands that effect changes in the body 22. A long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body 23. ct as the first and main form of active immune defense in the central nervous system