Nervous System

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Across
  1. 3. specialized cell transmitting nerve impulses; a nerve cell
  2. 7. a neuron that transmits impulses between other neurons, especially as part of a reflex arc
  3. 13. a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body
  4. 14. condition in which fluid accumulates in the brain, typically in young children, enlarging the head and sometimes causing brain damage
  5. 15. a mixture of proteins and phospholipids forming a whitish insulating sheath around many nerve fibers, increasing the speed at which impulses are conducted
  6. 16. a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber
  7. 18. a chronic, typically progressive disease involving damage to the sheaths of nerve cells in the brain and spinal cord, whose symptoms may include numbness, impairment of speech and of muscular coordination, blurred vision, and severe fatigue
  8. 19. the tough outermost membrane enveloping the brain and spinal cord
  9. 20. any of a class of aromatic amines that includes a number of neurotransmitters such as epinephrine and dopamine
  10. 24. self
Down
  1. 1. a star-shaped glial cell of the central nervous system
  2. 2. a compound present in the body as a neurotransmitter and a precursor of other substances including epinephrine
  3. 3. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure
  4. 4. the three membranes (the dura mater, arachnoid, and pia mater) that line the skull and vertebral canal and enclose the brain and spinal cord
  5. 5. is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival
  6. 6. forms the myelin sheath around axons in the central nervous system
  7. 8. glial cells derived from mesoderm that function as macrophages (scavengers) in the central nervous system and form part of the reticuloendothelial system
  8. 9. insensitivity to pain, especially as artificially induced by the administration of gases or the injection of drugs before surgical operations
  9. 10. of or relating to the part of the automatic nervous system that counterbalances the action of the sympathetic nerves
  10. 11. a compound that occurs throughout the nervous system, in which it functions as a neurotransmitter.
  11. 12. a group of brain cells that are important in the brain's immune response
  12. 17. an organ or cell that acts in response to a stimulus
  13. 18. a nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland
  14. 21. a fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord, situated between the dura mater and the pia mater
  15. 22. the long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells
  16. 23. pain relieving chemicals