Brain Structures Overview: Thalamus, Hypothalamus, & Limbic System
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Questions and Answers

What is the primary function of the spinothalamic pathway in the somatosensory system?

  • To transmit fine touch, pressure, vibration and proprioception
  • To transmit crude touch and pressure sensations
  • To transmit pain and temperature sensations (correct)
  • To transmit sensations of fast, sharp pain
  • What is the primary function of lateral inhibition in the somatosensory pathways?

  • To increase the intensity of stimulation in surrounding areas
  • To facilitate the localization of the site of stimulation (correct)
  • To decrease the sensitivity of the receptor pathway
  • To amplify the transmission of impulses in less intensely stimulated pathways
  • What type of neurotransmitter is typically released by nociceptors to signal pain?

  • GABA
  • Substance P or glutamate (correct)
  • Dopamine
  • Serotonin
  • Which of the following best describes the role of the second-order sensory neuron in the somatosensory pathways?

    <p>It crosses to the opposite side of the CNS and ascends to the thalamus</p> Signup and view all the answers

    What is the primary function of the posterior column pathway in the somatosensory system?

    <p>To transmit highly localized touch, pressure, vibration and proprioception</p> Signup and view all the answers

    How do the somatosensory pathways ultimately reach the level of conscious awareness?

    <p>Through the primary sensory cortex</p> Signup and view all the answers

    Which type of nociceptor fibers are responsible for transmitting sensations of fast, sharp pain?

    <p>Myelinated A-delta fibers</p> Signup and view all the answers

    What is the role of the first-order sensory neuron in the somatosensory pathways?

    <p>It is the afferent neuron with its peripheral receptor that first detects the stimulus</p> Signup and view all the answers

    What is the primary function of pain perception in the somatosensory system?

    <p>To bring to conscious awareness tissue damage that is occurring or about to occur</p> Signup and view all the answers

    How do the somatosensory pathways become 'labeled' according to modality and location?

    <p>Through the decoding of the stimulus by the CNS based on the specific pathway that carries it</p> Signup and view all the answers

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