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Across 3. carry nerve impulses away from the central nervous system to effectors 6. A type of neuroligial cell that surrounds an axon ofa peripheral neuron, forming the neruilemmal sheath and myelin 7. the basic building blocks of the nervous system 11. Acts as a control system functioning largely below the level of consciousness, and controls visceral functions 15. ct as the first and main form of active immune defense in the central nervous system 20. The part of the nervous system that integrates the information that it receives 23. A bundle of axons in the peripheral nervous system 25. Masses of neuron cell bodies, usually outside the central nervous system 26. Fatty layers formed from certain neruoglia that surrounds axons, providing insulation

Down 1. Consists of the nerves and ganglia outside of the brain and spinal cord 2. A long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body 4. Chemicals that axons secrete on effectors or other neurons 5. carry nerve impulses from receptors or sense organs towards the central nervous system 8. A type of neuroglial cell that forms myelin 9. The voluntary control of body movements 10. Portion of nerve cell that includes cytoplasmic mass and a nucleus and form which nerve fibers extend 12. 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. 13. Branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body 14. Muscles or glands that effect changes in the body 16. 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 17. The gaps formed between the myelin sheaths generated by different cells 18. The difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane 19. Neuroligal cells tat line the ventricles of the brain 21. A type of neuroglial cell that connects neurons to blood vessels 22. specialized cells of the nervous system that produce myelin, communicate between cells, maintain the ionic environment, and nurture the differentiation of neruons 24. 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