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Across 4. part of the nervous that controls the viscera 5. process of a neuron that recevies input from outer neurons 9. muscles or glands that effect changes in the body 12. a nerve fiber 18. neuroglial cells that line the ventricles of the brain 21. the brain and spinal cord 22. nerve cells 24. portion of nerve cell that includes a cytoplasmic mass and a nucleus and form which nerve fibers extend 25. arise from motor neuron cell bodies in the ventral horns of the gray matter within the spinal cord. 26. the sequence of elcctrical changes that qccurs in a portion of a nerve cell membrene that is exposed to a stimulus that exceeds the membranes threshold 27. chemicals that axons secrete on effectors or other neurons

Down 1. or neurolemmocytes are the principal glia of the peripheral 2. part of the nervous systemoutside the central nervous system 3. specialized structures associated with the peripheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which are transmitted to the central nervous system 6. the membrane potential to which a membrane must be depolarized to initiate an action potential 7. motoe pathways of the peripheral nervous system that lead to the skin and skeletal muscles 8. cells of a nervous system that produce myelin 10. the diffrence in electrical charge between the inside and outside of an undisturbed nerve cell membrane 11. fatty layers that form from certain neuroglia 13. a typeof neuroglial cell that connects neurons to blood vessels 14. specialized structures associated with the peripheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which are transmitted to the central nervous system 15. a form of neuroglail cells that forms myelin 16. narrow gaps between small cells 17. a neuroglial cell that supports neurons and phagocytizes 19. masses of neuron cell bodies usually outside the central nervous system 20. a bundle of axons in the perpiheral nervous system 23. 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