Nervous System

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Across
  1. 2. nerve fiber is a long, slender projection of a nerve cell
  2. 6. neuron sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
  3. 7. neurotransmitter receptors interact with receptor proteins on the membrane of the postsynaptic cell, causing ionic channels on the membrane to either open or close
  4. 10. the basic working unit of the brain, a specialized cell designed to transmit information to other nerve cells, muscle, or gland cells
  5. 12. of Ranvier a gap in the myelin sheath of a nerve, between adjacent Schwann cells
  6. 14. a thing or event that evokes a specific functional reaction in an organ or tissue
  7. 16. a sensory receptor that receives stimuli from within the body, especially one that responds to position and movement
  8. 17. sheath an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord
  9. 18. cells a type of glial cells of the peripheral nervous system that help form the myelin sheath around the nerve fibers
  10. 19. terminal refers to the axon endings that are somewhat enlarged and often club or button-shaped
  11. 21. the central nodes of neural circuits, enabling communication between sensory or motor neurons and the central nervous system (CNS)
  12. 22. 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
Down
  1. 1. a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body
  2. 3. N.S. the nervous system outside the brain and spinal cord
  3. 4. membrane a specialized area of the membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction
  4. 5. neuronal junction
  5. 6. N.S. acts largely unconsciously and regulates bodily functions
  6. 7. membrane the membrane that receives a signal from the presynaptic cell and responds via depolarisation or hyperpolarisation
  7. 8. N.S. the complex of nerve tissues that control the activities of the body. In vertebrates, it comprises the brain and spinal cord
  8. 9. body also called the soma, is the spherical part of the neuron that contains the nucleus
  9. 10. bodies also known as nissl substance and nissl material is a large granular body found in neurons
  10. 11. another term for glia
  11. 13. a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber
  12. 15. N.S. part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles
  13. 20. 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