1															2		3						4					5
			6		7
								8
																										9
	10
										11
										12
13							14
			15
			16							17
					18
							19
										20											21
			22															23
24
				25

Across 2. Process of a neuron that receives input from other neurons. 10. A type of neuroglial cell that forms myelin 11. Portion of nerve cell that includes a cytoplasmic mass and a nucleus and from which nerve fibers extend 12. Chemicals that axons secrete on effectors (muscles or glands) or other neurons 14. A type of neurolglial cell that connects neurons to blood vessels 15. Once the trigger region of an axon reaches threshold the action potential becomes self generating 16. A nerve fiber. It conducts a nerve impulse away from the neuron cell body. 17. Specialized cells of the nervous system that produce myelin, communicate between cells maintain the ionic environment and nurture the differentiation of neurons. 18. A nerve that passes impulses from receptors toward or to the central nervous system afferent, sensory nerve 19. Carries impulses from the CNS to muscles or glands. 20. 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. 22. Fatty layers formed from certain neuroglia that surround axons providing insulation. 24. The difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane. 25. Neurolglial cells that line the ventricles of the brain.

Down 1. A neuroglial cell that supports neurons and phagocytizes 3. Bundle of axons in the peripheral nervous system 4. A type of neuroglial cell that surrounds an axon of a peripheral neuron forming the neurilemmal sheath and myelin. 5. Motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles 6. 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. 7. Part of nervous system that controls the viscera 8. Masses of neuron cell bodies, usually outside the central nervous system. 9. Nerve Cells 11. The brain and spinal cord 13. Asmall gap in the myelin sheath of a myelinated nerve fiber 21. Muscles or glands that effect changes in the body. 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.