Dermatomes and Fine Touch Sensations Quiz
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Questions and Answers

Which type of nerve fiber is responsible for transmitting the hot sensation?

  • A delta fiber
  • C fiber (correct)
  • Both A delta and C fibers
  • None of the above
  • What is the main difference between the adaptation rate of cold and hot sensations?

  • Hot sensation adapts faster than cold sensation (correct)
  • Cold sensation adapts faster than hot sensation
  • Both cold and hot sensations have the same adaptation rate
  • Cold sensation does not adapt at all, while hot sensation adapts moderately
  • Which tract is responsible for transmitting the crude-touch sensation?

  • Both lateral and ventral spinothalamic tracts
  • Neither lateral nor ventral spinothalamic tracts
  • Ventral spinothalamic tract (correct)
  • Lateral spinothalamic tract
  • Which receptor is responsible for the hair-end organ component of crude-touch sensation?

    <p>Hair end organ</p> Signup and view all the answers

    What is the main difference in the adaptation rate between the hair end organ and free nerve endings for crude-touch sensation?

    <p>Hair end organ adapts faster than free nerve endings</p> Signup and view all the answers

    What is the main purpose of touching the subject's skin with test tubes containing cold water at 15°C and hot water at 40°C?

    <p>To test the subject's ability to distinguish between hot and cold sensations</p> Signup and view all the answers

    What is the receptor involved in point localization and tactile discrimination?

    <p>Merkel's discs</p> Signup and view all the answers

    Which type of nerve fiber afferent is responsible for fine touch sensation?

    <p>A beta</p> Signup and view all the answers

    Which part of the nervous system is responsible for processing tactile localization information?

    <p>Dorsal column</p> Signup and view all the answers

    How is point localization tested?

    <p>By applying two points to the skin with a compass</p> Signup and view all the answers

    Which test assesses the ability to feel two separate points simultaneously on the skin?

    <p>Two-point discrimination test</p> Signup and view all the answers

    Which body parts are mentioned as having more accurate tactile localization and discrimination?

    <p>Distal parts of the body</p> Signup and view all the answers

    Which tract is responsible for transmitting fine touch, vibration, and proprioceptive sensations?

    <p>Dorsal column tract</p> Signup and view all the answers

    Which condition can cause degeneration and demyelination of the dorsal column tract, leading to sensory deficits?

    <p>Tabes dorsalis (syphilis infection)</p> Signup and view all the answers

    Which condition is characterized by degeneration of myelinated fibers in the dorsal column, resulting in loss of proprioception, vibration, and tactile discrimination?

    <p>Pernicious anemia (vitamin B12 deficiency)</p> Signup and view all the answers

    Which syndrome is characterized by a hemisection of the spinal cord, resulting in a specific pattern of sensory and motor deficits?

    <p>Brown-Séquard syndrome</p> Signup and view all the answers

    Which anatomical structure's lesion can lead to loss of all sensations on the contralateral side of the body?

    <p>Internal capsule</p> Signup and view all the answers

    Which brain region's lesion can result in loss of sensations at the representative area on the contralateral side of the body?

    <p>Parietal cortex</p> Signup and view all the answers

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