Sensory Pathways and Thalamus Termination Points
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Sensory Pathways and Thalamus Termination Points

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Questions and Answers

Which laminae receive presynaptic terminals from A beta neurons?

  • Lamina 3
  • Lamina 6
  • Lamina 4
  • Lamina 5 (correct)

    • Which tract is responsible for carrying both noxious and non-noxious information from A beta, A delta, and C fibers from the periphery to the thalamus?

  • Paleospinothalamic tract
  • Anterior Pathway
  • Neospinothalamic tract (correct)
  • Lateral Pathway

    • Where does the primary somatosensory cortex (PSC) receive projections primarily from the neospinothalamic tract?

  • Hypothalamus
  • Reticular formation
  • Primary somatosensory cortex (correct)
  • Periaqueductal gray

    • What is the first step in nociception process?

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

    Which structure plays a role in sensory modulation and descending inhibition?

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

    Where does the transmission stage of nociception begin and end?

    <p>At the synapse between 2nd order neurons and ends in the brain</p> Signup and view all the answers

    Which structure is a key in the propagation of pain modulation, sympathetic responses, and learning an action of defensive and aversive behaviors?

    <p>Periaqueductal gray</p> Signup and view all the answers

    What is the primary role of endogenous opioids at the level of the brain?

    <p>Inhibiting fear associated with pain</p> Signup and view all the answers

    What is the main mechanism for central sensitization?

    <p>Homosynaptic potentiation</p> Signup and view all the answers

    What is the main function of the spinothalamic tract?

    <p>Convey nociceptive and discriminatory information from A-delta and C-fibers to the sensory cortex</p> Signup and view all the answers

    How does the gate control theory relate to nociceptive modulation?

    <p>It acutely reduces the magnitude of nociceptive action potential before reaching the brain</p> Signup and view all the answers

    What is the role of descending inhibition systems in nociceptive modulation?

    <p>Inhibit nociceptive input to the brain through descending neuronal pathways</p> Signup and view all the answers

    What is the primary role of the Reticular Formation RN and Raphe Nuclei PVG & PAG in the context of pain modulation?

    <p>Inhibition of chronic nociception</p> Signup and view all the answers

    Which structure(s) are associated with the modulation of visceral, emotional, and autonomic responses in the context of pain processing?

    <p>Thalamus and Primary Somatosensory Cortex</p> Signup and view all the answers

    What is the main function of the Dorsal Horn interneurons in the context of pain modulation?

    <p>To modulate sensory input</p> Signup and view all the answers

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