Nervous System Crossword

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Across
  1. 4. Afferent neurons are also called _______ neurons. They transmit impulses from receptors into the CNS.
  2. 6. Phagocytic cells (macrophages) in the central nervous system
  3. 7. Part of the peripheral nervous system; regulates involuntary (visceral) processes
  4. 9. A white, insulating layer around a nerve fiber; speeds nerve impulses.
  5. 12. These cells form the myelin sheath in the PNS
  6. 14. The gaps between segments of myelin are called nodes of ______.
  7. 15. The neuron cell body (the control center)
  8. 16. “Fight or flight” division of the ANS
  9. 18. Branches of the neuron that conduct an action potential toward the cell body
Down
  1. 1. The parasympathetic nervous system usually ______ heart rate and respiration.
  2. 2. These neurons transmit impulses from the brain/spinal cord into muscles and glands. Also called motor neurons.
  3. 3. The somatic motor division of the PNS stimulates _____ muscle.
  4. 5. Myelin-forming neuroglia in the brain and spinal cord
  5. 8. Ependymal cells secrete this
  6. 10. Long part of the neuron that conducts an action potential away from the cell body
  7. 11. Immune cells attack the myelin sheath in multiple _______. (disease)
  8. 13. Star-shaped cells that form the barrier between neurons and blood vessels
  9. 17. _______ Nervous System (All of the nervous system except the brain and spinal cord.)