Innervation of the Skin and Primary Afferent Axons Quiz
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Questions and Answers

Which type of axons bring information from the somatic sensory receptors to the spinal cord or brain stem?

  • Secondary afferent axons
  • Primary afferent axons (correct)
  • Interneurons
  • Motor axons
  • Where are the cell bodies of the primary afferent axons located?

  • Ventral roots
  • Brain stem
  • Dorsal roots (correct)
  • Spinal cord
  • What determines the size of primary afferent axons?

  • Presence of myelin
  • Speed of action potential conduction
  • Type of sensory receptor (correct)
  • Location in the body
  • What are the two sets of names used to designate the different sizes of axons?

    <p>Arabic and Greek letters, Roman numerals</p> Signup and view all the answers

    Which type of axons are unmyelinated?

    <p>Group C (or IV) axons</p> Signup and view all the answers

    What is the diameter of the smallest axons, the C fibers?

    <p>Less than about 1 μm</p> Signup and view all the answers

    What types of sensations do C fibers mediate?

    <p>Pain, temperature sensation, and itch</p> Signup and view all the answers

    What is the speed of action potential conduction along C fibers?

    <p>About 0.5–1 m/sec</p> Signup and view all the answers

    What determines the speed of action potential conduction in axons?

    <p>Diameter of the axon and presence of myelin</p> Signup and view all the answers

    How fast is the conduction of action potentials along C fibers compared to taking a step?

    <p>Slower than taking a step</p> Signup and view all the answers

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