Nervous System

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Across
  1. 2. Brain and spinal cord make up this division of the nervous system
  2. 4. Supports neurons and helps form the blood-brain barrier in the CNS
  3. 5. Myelinated fiber that transmits sharp, localized pain
  4. 6. Brainstem region involved in descending pain modulation
  5. 8. Neurotransmitter released by the raphe nuclei during pain inhibition
  6. 12. Type of reflex with only one synapse between sensory and motor neurons
  7. 15. Spinal horn where motor neurons reside
  8. 17. Glial cell responsible for myelination in the PNS
  9. 18. Type of motor neuron that innervates extrafusal muscle fibers
  10. 19. Type of reflex initiated by muscle spindle activation
  11. 20. Major ascending tract that transmits pain and temperature
  12. 21. Unmyelinated fiber that transmits slow, dull pain
  13. 23. Area of skin innervated by a single spinal nerve
  14. 24. Motor system that controls voluntary movement of skeletal muscles
Down
  1. 1. Term for motor or sensory functions involving internal organs
  2. 3. Type of pain felt at a site distant from its actual origin
  3. 6. Division of the autonomic nervous system responsible for "rest and digest"
  4. 7. Mechanism by which visceral and somatic afferents share spinal neurons
  5. 9. Myelin-producing cell in the CNS
  6. 10. Nerves and ganglia outside the brain and spinal cord
  7. 11. Nerves that carry autonomic fibers to abdominal and pelvic viscera
  8. 13. Spinal horn where sensory neurons synapse
  9. 14. Type of endogenous opioid that modulates pain
  10. 16. An automatic motor response to a sensory stimulus
  11. 19. Division of the autonomic nervous system responsible for "fight or flight"
  12. 22. Type of motor neuron that adjusts sensitivity of muscle spindles