Nervous System

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Across
  1. 3. the sequence of electrical changes that occurs in a portion of a nerve
  2. 7. sheath formed from Schwann cells on outside of some nerve fibers
  3. 10. nerve fiber that conducts nerve impulses away from neuron cell body
  4. 12. a specialized structure associated with the peripheral end of a sensory neuron specific to detecting a particular sensation and triggering a nerve impulse in response, which is transmitted to the central nervous sytem
  5. 13. functional connection between the axon of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type
  6. 16. Nerve impulses arriving at the same neuron
  7. 17. process of a neuron that receives input from other neurons
  8. 20. portion of the autonomic nervous system that arises from the thoracic and lumbar regions of the spinal cord
Down
  1. 1. the portions of the nervous system outside the central nervous system
  2. 2. a network of interlaced nerves or blood vessels
  3. 4. portion of the autonomic nervous system that arises from the brain and sacral region of the spinal cord
  4. 5. a mass of neuron cell bodies, usually outside the central nervous system
  5. 6. brain and spinal cord
  6. 8. spreading apart
  7. 9. chemical that an axon end secretes on an effector or another neuron
  8. 11. the part of the PNS that controls the glands and the muscles of the internal organs
  9. 14. subthreshold stimulation of a neuron that increases responsiveness to further stimulation
  10. 15. 3 protective membranes that surround the brain and spinal cord
  11. 18. body large granular body found in neurons, have ribosomes attached
  12. 19. rapid automatic response to a stimulus
  13. 21. a fatty substance that helps insulate neurons and speeds the transmission of nerve impulses
  14. 22. motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles
  15. 23. a muscle or gland that effects change in the body