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Across 1. a short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls (2 Words) 5. a sensory nerve ending that responds to a stimulus in the internal or external environment of an organism (2 Words) 7. the spinal nerves contain the fibers of the sensory and motor neurons (2 Words) 10. the epithelial cells that line the CSF-filled ventricles in the brain (2 Words) 16. cordlike bundles of fibers made up of neurons through which sensory stimuli and motor impulses pass between the brain or other 18. part of the peripheral nervous system that is responsible for carrying motor and sensory information (3 Words) 20. the part of the peripheral nervous system that acts as a control system (3 Words) 22. a structure that permits a neuron to pass an electrical or chemical signal to another cell 23. a neuron is not sending a signal (2 Words) 24. non-neuronal cells that maintain homeostasis, form myelin, and provide support and protection 25. branched projections of a neuron that act to conduct the electrochemical stimulation

Down 2. consists of the nerves and ganglia outside of the brain and spinal cord (3 Words) 3. also known collectively as astroglia, are characteristic star-shaped glial cells in the brain and spinal cord 4. is the part of the nervous system that integrates the information that it receives from, and coordinates the activity of, all parts (3 Words) 6. the membrane potential to which a membrane must be depolarized to initiate an action potential (2 Words) 7. a type of glial cell that are the resident macrophages of the brain and spinal cord 8. the soma of a neuron (2 Words) 9. the gaps formed between the myelin sheaths (3 Words) 10. a molecule that binds to a protein 11. he principal glia of the peripheral nervous system (2 Words) 12. also called Primary Afferent Fiber (2 Words) 13. allow impulses to transmit quickly and efficiently along the nerve cells (2 Words) 14. provide support to axons and to produce the Myelin sheath 15. endogenous chemicals that transmit signals from a neuron to a target cell across a synapse 17. electrically excitable cell that processes and transmits information by electrical and chemical signaling 19. a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma 21. a biological tissue mass, most commonly a mass of nerve cell bodies