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Across 3. fatty material that forms a sheathlike covering around some axons 6. process of a neuron that receives input from other neurons 10. Portion of nerve cell that includes a cytophasmic mass and a nucleus and from which nerve fibers extended 11. a nerve that consists of motor neuron axons 12. a nerve fiber 13. A bundle of axons in the peripheral nervous system 15. a type of neuroglial all that connects neurons to blood vessels 18. Motor pathways of the peripheral nervous system that bad to the skin and skeletal muscles. 19. 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 20. A type of neuroglial cell that forms myclin 21. The brain and spinal cord. 23. A neuroglial cell that supports neurons and phagorytrizes 24. the sequence of electrical changes that occurs in a portion of a nerve cell membrain that is exposed to a stimulus that exceeds the membranes threshold 25. Nerve cells

Down 1. Part of the nervous system outside the central nervous system. 2. the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane 4. Neuroglial cell that line the ventricles of the brain 5. Part of nervous system that controls the viscira 7. Specialized cells of the nervous system that produe mylin, communicte between cells maintain and nurture the defferention of neurons 8. Chemicals that axons secret on effectors or other neurons 9. a nerve composed of sensory nerve fibers 14. muscles or glands that effect changes in the body 16. a type of neuroglial cell that surronds an axon of a peripheral neuron forming the neurilemmal sheath and myelin 17. specialiged structures associated with the peripheral ends of senory neurons specific to detecting 22. Masses of neuron cell bodies ussaly outside the central nervous system