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Across 1. a type of neuroglial cell that surrounds an axon of a peropheral neuron forming the neurilemmal sheath and myelin. 5. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 8. part of nervous system that controls the viscera 9. A gap in the myelin sheath of a nerve, between adjacent Schwann cells 10. masses of neuron cell bodies, usually outside the central nervous system 11. a type of neuroglial cell that connects neurons to blood vessels. 13. 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. 15. the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane. 16. stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction. 17. Part of the nervous system outside the central nervous system 18. portion of nerve cell that includes a cytoplasmic mass and a nucleus and from which nerve fibers extend 19. the sequence of electrical changes that occurs in a portion of a nerve cell membrane that is exposed to a stimulus that exceeds the membrane's threshold. 22. a nerve that consists of motor neuron axons. 23. chemicals that axons secrete on effectors or other neurons 24. a neuroglial cell that supports neutrons and phagocytizes. 25. a type of neuroglial cell that forms myelin 26. specializes 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.

Down 2. a nerve composed of sensory nerve fibers 3. neuroglial cells that line the ventricles of the brain. 4. fatty layers formed from certain neuroglial that surround anon. providing insulation. 6. The brain and spinal cord 7. nerve cells 8. a nerve fiber. it conducts a nerve impulse away from the neuron cell body. 12. process of a neuron that receives input from other neurons. 14. a bundle of axons in the peripheral nervous system. 20. muscles or glands that effect changes in the body 21. specialized cells of the nervous system that produce myelin, communicate between cells, maintain the ionic environment, and nurture the differentiation of neurons.