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Across 3. peripheral nerves that connect the CNS to other body parts (3 Words) 4. carry nerve impulses form CNS to effectors (3 Words) 7. a neurological cell that supports neurons and phagocytizes 9. a bundle of axons in the peripheral nervous system 10. a nerve fiber that conducts a nerve impulse away from the neuron body cell 11. masses of neuron cell bodies, usually outside the central nervous system 14. muscles or glands that effect changes in the body 18. pain resulting from inflammation of a nerve or a group of nerves 19. controls effectors such as the heart,smooth muscle in blood vessels,and various glands (3 Words) 21. the brain and spinal cord (3 Words) 22. nerve cells 23. the functional connection between the axon of a neuron and the dendrite or cell ody of another neuron or the membrane of another cell type 24. the sequence of electrical changes that occurs in a portion of nerve cell membrane that is exposeed to a stimulus that exceeds the membrane's threshold (2 Words) 25. process of a neuron that recieves input from other neurons

Down 1. chemicals that axons secrete on effectors or other neurons 2. carry nerve impulses from receptors or sense organs towards the central nervous system. (3 Words) 4. fatty material that forms a sheathlike covering around some axons (2 Words) 5. form an epithelia-like membrane that covers specialized brain parts and forms the inner linings that enclose spaces within the brain and spinal cord (2 Words) 6. a type of neuroglial cell that forms myelin 8. stimulation level that must be exceeded to elicit a nerve impulse or muscle contraction (2 Words) 12. controls skeletal muscle (3 Words) 13. narrow gaps between Schwann cells (3 Words) 15. the difference in electrical charge between the inside and the outside of an undisturbed cell membrane (2 Words) 16. specialized structures associated with 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 (2 Words) 17. a type of neuroglia cell that surrounds an axon of a peripheral neuron, forming the neurilemmal sheath and myelin (2 Words) 19. a type of neuroglia cell that connects neurons to blood vessels 20. portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend (2 Words)