Nervous System

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Across
  1. 3. the fundamental units of the brain and nervous system, the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between
  2. 8. are motor neurons that carry neural impulses away from the central nervous system and towards muscles to cause movement
  3. 10. a gap in the myelin sheath of a nerve between adjacent Schwann cells
  4. 11. a chemical substance that is released at the end of a nerve fiber
  5. 12. he part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles
  6. 14. a specialized area of membrane of the axon terminal
  7. 15. any of the cells that hold nerve cells in place and help them work the way they should
  8. 16. the site of transmission of electric nerve impulses between two nerve cells
  9. 18. the complex of nerve tissues that controls the activities of the body
  10. 19. a large granular body found in neurons
  11. 20. generally can refer to any neuron that acts as an intermediary in passing signals between two other neurons
  12. 22. portion of a nerve cell that carries nerve impulses away from the cell body
Down
  1. 1. are sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
  2. 2. are small swellings that are found at the terminal ends of axons
  3. 4. a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord and impulses from these to the muscles and organs
  4. 5. myelin is an insulating layer or sheath that forms around nerves including those in the brain and spinal cord
  5. 6. a short branched extension of a nerve cell
  6. 7. the membrane that receives a signal
  7. 9. the nucleus-containing central part of a neuron exclusive of its axons and dendrites
  8. 12. are the main glial cells of the peripheral nervous system
  9. 13. a control system that acts largely unconsciously and regulates bodily functions
  10. 14. a sensory receptor which receives stimuli from within the body
  11. 17. the nervous system outside the brain and spinal cord
  12. 21. a structure containing a number of nerve cell bodies