Nervous system

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Across
  1. 2. The long bundle of nerves extending from the brain down the back.
  2. 4. The brief electrical signal that travels down the axon.
  3. 5. Supporting cells that protect and nourish the neurons.
  4. 7. A chemical used by a neuron to signal a neighboring cell.
  5. 9. The small gap or junction between two communicating neurons.
  6. 10. The main control center of the central nervous system.
  7. 12. The long projection that carries signals away from the cell body.
Down
  1. 1. The branched part of a neuron that receives incoming signals.
  2. 3. The specialized cell that transmits electrical and chemical signals.
  3. 6. The part of the system that controls involuntary body functions.
  4. 7. A bundle of axons outside the brain and spinal cord.
  5. 8. The fatty material that insulates the axon and speeds up impulses.
  6. 11. An involuntary, rapid, and automatic response to a stimulus.