Autonomic Ganglion and Nervous System Organization
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Questions and Answers

Where do the preganglionic neurons of the parasympathetic nervous system originate?

  • Adrenal medulla
  • Nuclei of cranial nerves (correct)
  • Spinal cord segments T1–L3
  • Thoracolumbar region
  • Where are the sympathetic ganglia located?

  • Near the effector organs
  • Adrenal medulla
  • Paravertebral chain (correct)
  • Spinal cord segments S2–S4
  • What is the adrenal medulla considered to be in relation to the sympathetic nervous system?

  • Specialized ganglion (correct)
  • Effector organ
  • Postganglionic neurons
  • Preganglionic neurons
  • Where are the parasympathetic ganglia located?

    <p>In or near the effector organs</p> Signup and view all the answers

    Where do the preganglionic neurons of the sympathetic nervous system originate?

    <p>Spinal cord segments T1–L3</p> Signup and view all the answers

    What is the primary neurotransmitter released at all preganglionic endings in both the sympathetic and parasympathetic nervous systems?

    <p>Acetylcholine</p> Signup and view all the answers

    In which type of autonomic ganglia do the preganglionic fibers relay to the head, neck, thorax, and some abdominal viscera?

    <p>Paravertebral (lateral) ganglia</p> Signup and view all the answers

    How many postganglionic neurons can a single sympathetic preganglionic fiber synapse with?

    <p>20 or more postganglionic neurons</p> Signup and view all the answers

    Where are the sites of relay for preganglionic parasympathetic fibers located?

    <p>Terminal ganglia</p> Signup and view all the answers

    What is the primary neurotransmitter secreted by chromaffin cells into the circulation?

    <p>Epinephrine</p> Signup and view all the answers

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