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Across 5. The fatty sheath that covers the axon of a neuron 8. The set of lobes in the cerebral cortex that include the auditory areas and process hearing 9. The long neuron extension that passes messages from the cell body of the neuron to other neurons 10. The division of the nervous system that consists of the brain and spinal cord 15. The first person to surmise that the brain was the center of thought and intelligence 16. A molecule that inhibits the action of a specific neurotransmitter 17. Another name for a neural impulse that travels down the axon 19. The division of the peripheral nervous system that controls glands and muscles of internal organs 21. The band of neural fibers that connects the two brain hemispheres 22. The neural center in the limbic system that processes conscious memories 25. The producing of new neurons 28. The "little brain" that helps control voluntary movement, as well as episodic memory 30. The branching extensions of a neuron that receive messages from other cells 31. The division of the nervous system that consists of sensory and motor neurons 34. The now-defunct school of thought that different aspects of personality were housed in different parts of the brain; developed by Franz Gall 36. The body's "slow" chemical messenger system that uses glands to secrete its messengers 37. The basic building block of the nervous system 38. The fluid-filled junction between the axon tip of a sending neuron and the dendrite of the receiving neuron 39. The set of lobes in the cerebral cortex that receive information from the visual fields 40. The set of lobes in the cerebral cortex in charge of speaking, muscle movement, planning and judgment 41. The division of the peripheral nervous system that controls the body's skeletal muscles 42. The lima-bean-sized neural clusters of the limbic system that control fear and aggression

Down 1. The brain structure that controls heartbeat and breathing 2. The man whose bizarre brain injury, while leaving alone his ability to walk, talk, and otherwise function, suffered a tremendous shift in personality (last name) 3. Chemical messengers that cross the synaptic gaps between neurons 4. The messenger of the endocrine system that travels through the bloodstream 6. A neurotransmitter that acts as a major inhibitory neurotransmitter 7. A neurotransmitter that influences movement, learning, attention, and emotion 11. Tissue destruction; A method used to study the brain 12. The formation of nerve networks through the brainstem and helps control arousal 13. The bizarre phenomenon that occurs when one feels sensations in a part of the body that no longer exists 14. The neural structure of the limbic system that works with the endocrine system to control body temperature and eating 18. The sensory router of the brain, or the "grand central station of sensation"! 20. The portion of the cerebral cortex that controls sensation and body movement 23. a form of psychology that studies the links between genetic, neural, and hormonal processes with our psychological processes; Also known as "biopsychology" 24. A neurotransmitter that affects mood, hunger, sleep, and arousal 26. The oldest part of the brain that controls automatic survival functions 27. Cells in the nervous system that support, nourish, and protect neurons 29. The brain's ability to change 32. The level of stimulation required to trigger a neural impulse 33. A molecule that mimics the action of a specific neurotransmitter 34. The set of lobes in the cerebral cortex in charge of receiving sensory input for touch and body position 35. The part of a neuron that contains the nucleus; the cell's life support system