Across
- 2. nerve fibers that carry information to the central nervous system.
- 6. when membrane becomes permeable to potassium ions, which rapidly diffuse out of the neuron.
- 9. sits on top of the brain stem.
- 10. can result in a potentially fatal head injury.
- 11. carry information from visceral organs.
- 13. processes smell.
- 15. processes taste.
- 17. an electrochemical change in a neuron to send a signal.
- 20. nerve fibers that carry impulses away from the central nervous system organs to effector organs.
- 23. gaps in myelin sheath along the axon.
- 25. line cavities of the brain and spinal cord.
- 28. paired superior parts of the brain.
- 29. a slight brain injury.
- 33. nerve cells that are specialized to transmit messages.
- 36. one-sided paralysis.
- 41. spiderlike phagocytes that monitor health of nearby neurons and dispose of debris.
- 43. controls breathing heart rate and breathing.
- 44. sodium channels now open, and sodium diffuses into the neuron.
- 46. involved in our ability to speak.
- 49. mostly unmyelinated fibers and cell bodies.
- 50. activates muscles or glands.
- 51. attaches to the spinal cord.
- 54. is the middle layer of the meninges.
- 56. is a spatial map of touch receptors.
- 57. conduct impulses away from the cell body.
- 59. plasma membrane is inactive.
- 60. forms a watery cushion to protect the brain and spinal cord.
- 62. carry impulses to and from the spinal cord.
- 66. bundles of nerve fibers in the PNS.
- 67. houses pineal body.
- 69. is the outer covering of the meninges.
- 70. a tough membrane covering the brain and spinal cord.
- 71. allows us to consciously move skeletal muscles.
- 72. carry information from the skin, skeletal muscles, and joints.
- 73. nerves extending from the brain and spinal cord.
- 74. support cells.
- 75. nucleus and metabolic center of the cell.
Down
- 1. area receives impulses from the body’s sensory receptors.
- 3. processes and interprets sensory input and decides whether action is needed.
- 4. is the internal layer of the meninges.
- 5. the gap between axon terminals and the next neuron.
- 7. excludes many potentially harmful substances.
- 8. restores initial conditions of sodium and potassium using ATP.
- 12. bundles of nerve fibers in the CNS.
- 14. processes hearing.
- 16. an important autonomic nervous system center:
- 18. gathering information.
- 19. fibers that extend from the cell body.
- 21. decreased elasticity of blood vessels.
- 22. temporary restriction of blood flow.
- 24. is a spatial map of the motor area.
- 26. abundant, star-shaped cells that brace and anchor neurons to blood capillaries.
- 27. wrap axons in a jelly roll–like fashion (PNS) to form the myelin sheath.
- 30. controls balance and coordination.
- 31. conduct impulses toward the cell body.
- 32. include visual and auditory reflex centers.
- 34. produce myelin sheaths around axons of the CNS.
- 35. carry impulses to and from the brain.
- 37. made of the brain and spinal cord.
- 38. involved in the control of breathing.
- 39. white, fatty material covering axons.
- 40. the ability to respond to a stimulus and convert it to a nerve impulse.
- 42. results when blood circulation to a brain area is blocked and brain tissue dies.
- 45. marked nervous tissue destruction occurs.
- 47. a relay station for sensory impulses.
- 48. involuntary and controls smooth and cardiac muscles and glands.
- 52. voluntary and controls skeletal muscles.
- 53. the ability to transmit the impulse to other neurons, muscles, or glands.
- 55. collections of cell bodies outside the CNS in the PNS.
- 58. collections of myelinated fibers (tracts).
- 61. part of the Schwann cell external to the myelin sheath.
- 63. processes sight.
- 64. damage to speech center in left hemisphere.
- 65. provides a two-way conduction pathway to and from the brain.
- 68. functional junction between nerves where a nerve impulse is transmitted.