Synaptic Connections in Spinal Reflexes Quiz
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Questions and Answers

Where are the cell bodies of afferents in the trigeminal nerve (except those conveying proprioception) located?

  • Spinal cord
  • Thalamus
  • Medulla oblongata
  • Dorsal root ganglion (correct)
  • Which nucleus mediates fine touch stimuli, joint position, and vibration in the trigeminal nerve pathway?

  • Mesencephalic nucleus
  • Trigeminal sensory nucleus
  • Chief sensory nucleus (correct)
  • Spinal nucleus
  • The trigeminothalamic tract provides somatic sensation to which parts of the body?

  • Lower limbs
  • Head and neck (correct)
  • Abdomen
  • Upper limbs
  • Where does the spinal nucleus of the trigeminal nerve extend into?

    <p>Spinal cord</p> Signup and view all the answers

    Which part of the brain stem houses the trigeminal sensory nucleus?

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

    Which nucleus mediates pain and temperature sensations in the trigeminal nerve pathway?

    <p>Spinal nucleus</p> Signup and view all the answers

    Where does the central process make synaptic connections that mediate spinal reflexes and intersegmental coordination?

    <p>In the spinal gray matter</p> Signup and view all the answers

    Where does the second neuron have its cell body?

    <p>In the spinal cord</p> Signup and view all the answers

    Which structure does the Axon of the third neuron pass through before reaching the somatosensory cortex?

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

    What is the function of the dorsal (posterior) columns in the spinal cord?

    <p>Running from the spinal cord to the medulla</p> Signup and view all the answers

    Where does the main fiber of the central process remain?

    <p>On the ipsilateral side of the cord</p> Signup and view all the answers

    Which part of the central nervous system does the Axon of the second neuron cross over to?

    <p>Opposite side of the CNS</p> Signup and view all the answers

    Where are the cell bodies of proprioceptive afferents from the muscles of mastication and the temporomandibular joint located?

    <p>In the mesencephalic nucleus of the trigeminal</p> Signup and view all the answers

    Where do the axons of 2nd order neurons in the trigeminal nucleus decussate?

    <p>In the ventroposteromedial (VPM) nucleus of the thalamus</p> Signup and view all the answers

    Where do 3rd order neurons in the thalamus project to?

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

    Which part of the brain houses the mesencephalic nucleus of the trigeminal?

    <p>Medulla oblongata</p> Signup and view all the answers

    Which structure receives input from 2nd order neurons in the trigeminal nucleus?

    <p>Ventroposteromedial (VPM) nucleus of the thalamus</p> Signup and view all the answers

    What is the function of 3rd order neurons in the thalamus?

    <p>Project to the postcentral gyrus</p> Signup and view all the answers

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