Anatomy of the Spinal Cord - Trinity College Dublin
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Questions and Answers

Where do many afferent nerve fibers entering the spinal cord terminate?

  • Ventral horn
  • Lateral horn
  • Dorsal horn (correct)
  • Intermediate lateral horn
  • Which part of the spinal cord contains cell bodies of motion neurons innervating skeletal muscle?

  • Ventral horn (correct)
  • Intermediate lateral horn
  • Dorsal horn
  • Lateral horn
  • Which area within the spinal cord is well developed at cervical and lumbar levels in relation to limb innervation?

  • Intermediate lateral horn
  • Dorsal horn
  • Ventral horn (correct)
  • Lateral horn
  • Which part of the spinal cord is the main site of termination for primary afferent fibers?

    <p>Dorsal horn (A)</p> Signup and view all the answers

    Which horn of the spinal cord contains alpha and gamma motor neurons responsible for skeletal muscle innervation?

    <p>Ventral horn (D)</p> Signup and view all the answers

    Which neural pathways transmit sensory information from peripheral nerves to the cerebral cortex?

    <p>Ascending tracts (A)</p> Signup and view all the answers

    What structure is closely applied to the surface of the spinal cord and nerve roots?

    <p>Denticulate ligament (C)</p> Signup and view all the answers

    Which spinal nerve exits below the 7th cervical vertebra?

    <p>C8 (C)</p> Signup and view all the answers

    What is the name for the leash-like arrangement of the lumbar and sacral roots below the termination of the spinal cord?

    <p>Cauda equina (B)</p> Signup and view all the answers

    Which meningeal layer invests the spinal cord like a loose-fitting bag?

    <p>Arachnoid mater (D)</p> Signup and view all the answers

    In which region do the spinal cord segments lie adjacent to the corresponding vertebral bodies?

    <p>Cervical (C)</p> Signup and view all the answers

    What projects out laterally from the denticulate ligament to tether the spinal cord to the arachnoid and dura?

    <p>Shelves (B)</p> Signup and view all the answers

    What type of information does the dorsal column-medial lemniscal pathway transmit?

    <p>Discriminative touch (D)</p> Signup and view all the answers

    Which pathway conveys nociception and non-discriminative touch information?

    <p>Spinothalamic pathway (C)</p> Signup and view all the answers

    What is proprioception related to?

    <p>Location and movement of joints (A)</p> Signup and view all the answers

    Which tracts are responsible for the conscious, voluntary control of body and face muscles?

    <p>Pyramidal tracts (C)</p> Signup and view all the answers

    What type of information does the corticospinal tract carry?

    <p>Information from the cerebral cortex to the spinal cord (B)</p> Signup and view all the answers

    Which descending motor pathway passes through the pyramids of the medulla?

    <p>Corticospinal tract (C)</p> Signup and view all the answers

    What type of information does the spinothalamic pathway convey?

    <p>Nociception and non-discriminative touch (A)</p> Signup and view all the answers

    Which ascending tracts are responsible for proprioception?

    <p>Spinocerebellar tracts (A)</p> Signup and view all the answers

    In the ascending tracts, which pathway is known for discriminative touch?

    <p>Dorsal column-medial lemniscal pathway (C)</p> Signup and view all the answers

    What type of sensory information do the ascending tracts transmit to the cerebral cortex?

    <p>Sensory information (C)</p> Signup and view all the answers

    Which ascending tract conveys information related to how hard someone is squeezing you?

    <p>Dorsal column-medial lemniscal pathway (B)</p> Signup and view all the answers

    What type of sensory information do the spinocerebellar tracts transmit?

    <p>Proprioception (A)</p> Signup and view all the answers

    Which ascending tract conveys unconscious sensory information related to joint location and muscle force?

    <p>Spinocerebellar tracts (D)</p> Signup and view all the answers

    Which ascending tract is responsible for conveying nociception and non-discriminative touch information to the cerebral cortex?

    <p>Spinothalamic pathway (A)</p> Signup and view all the answers

    Which ascending tract is known as the discriminative touch pathway?

    <p>Dorsal column-medial lemniscal pathway (A)</p> Signup and view all the answers

    Where do the ascending tracts transmit sensory information to?

    <p>Cerebral cortex (B)</p> Signup and view all the answers

    What is the main function of the pyramidal tracts in the major descending motor pathway?

    <p>Controlling voluntary movements of body and face muscles (B)</p> Signup and view all the answers

    Where does the majority (~85%) of the fibers from the corticospinal tract cross over in the brain stem?

    <p>Decussation of the pyramids (B)</p> Signup and view all the answers

    Which part of the body is controlled by the corticobulbar system in the descending motor pathway?

    <p>Face, head, and neck muscles (D)</p> Signup and view all the answers

    Where do the remaining 15% of fibers from the corticospinal tract cross over?

    <p>Spinal cord level of termination (A)</p> Signup and view all the answers

    Which type of neurons make up the corticobulbar tract?

    <p>Upper motor neurons (C)</p> Signup and view all the answers

    What type of movements are controlled by the pyramidal tracts in the major descending motor pathway?

    <p>Voluntary movements (B)</p> Signup and view all the answers

    Which part of the central nervous system do the pyramidal tracts mainly influence?

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

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