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Across 2. Chemicals that axons secrete on effectors or other neurons 5. a nerve fiber that carries impulses toward the muscles or glands (2 Words) 7. Part of the nervous system outside the central nervous system (3 Words) 11. a nerve fiber that carries impulses toward the central nervous system (2 Words) 14. 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 (2 Words) 17. The brain and spinal cord (3 Words) 19. Specialized structures associated with the peripheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response (2 Words) 24. A gap in the myelin sheath of a nerve, between adjacent Schwann cells (3 Words) 25. Masses of neuron cell bodies, usually outside the central nervous system 26. neuroglial cells that line the ventricles of the brain (2 Words) 27. Muscles or glands that effect changes in the body

Down 1. The functional connection between the axon of a neuron and the dendrite or cell body of another neuron of the membrane of another cell type 3. Part of the nervous system that controls the viscera (3 Words) 4. stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction (2 Words) 6. The difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane (2 Words) 8. A nerve fiber; conducts nerve impulses away from the neuron cell body 9. The supportive tissue of the nervous system 10. Motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles (3 Words) 12. A type of neuroglial cell that forms myelin 13. any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath (2 Words) 15. a layer of myelin encasing (and insulating) the axons of medullated nerve fibers (2 Words) 16. A type of neuroglial cell that connects neurons to blood vessels 18. Portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend (2 Words) 20. Process of a neuron that receives input from other neurons 21. A neuroglial cell that supports neurons and phagocytizes 22. A bundle of axons in the peripheral nervous system 23. Nerve cells