Anatomy of Voluntary Movement
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Questions and Answers

Where do the cell bodies of lower motor neurons reside?

  • Posterior horn of spinal gray matter
  • Anterior horn of spinal gray matter (correct)
  • Anterior root ganglion
  • Posterior root ganglion
  • Which part of the brain is responsible for planning and coordination of voluntary movement?

  • Brainstem
  • Cerebellum (correct)
  • Occipital lobe
  • Basal nuclei
  • What is the function of local interneurons in the motor pathways?

  • Coordinate sensory information in the cerebrum
  • Pass messages from upper motor neurons to lower motor neurons (correct)
  • Initiate reflex arcs in the spinal cord
  • Directly innervate skeletal muscles
  • Which descending pathway involves the right and left lateral corticospinal tracts?

    <p>Lateral corticospinal tract</p> Signup and view all the answers

    What does ALS primarily involve in terms of neural degeneration?

    <p>Degeneration of lower motor neurons</p> Signup and view all the answers

    What is the role of upper motor neurons in voluntary movement?

    <p>Pass signals through spinal cord synapsing with local interneurons</p> Signup and view all the answers

    What is the main function of the spinal cord?

    <p>Conduction of sensory information and motor commands</p> Signup and view all the answers

    Which structural component of the spinal cord is responsible for integrating input and executing appropriate output?

    <p>Central pattern generators</p> Signup and view all the answers

    Where is the conus medullaris located?

    <p>At the L1 or L2 vertebra</p> Signup and view all the answers

    What specialized muscle fibers are mentioned in the text?

    <p>Intrafusal muscle fibers</p> Signup and view all the answers

    Which component of the spinal cord anchors to the coccyx?

    <p>Terminal filum</p> Signup and view all the answers

    Which type of neurons innervate the contractile poles of intrafusal muscle fibers?

    <p>Gamma-motor neurons</p> Signup and view all the answers

    What is the function of tracts in the central nervous system?

    <p>Bundles of axons for communication within the brain and spinal cord</p> Signup and view all the answers

    What is the role of lower motor neurons in the somatic motor output?

    <p>They release acetylcholine onto muscle fibers</p> Signup and view all the answers

    'Gray matter' in the spinal cord primarily consists of which structures?

    <p>Clusters of neuron cell bodies</p> Signup and view all the answers

    What are motor neuron pools?

    <p>Groups of lower motor neurons from anterior horn of spinal cord</p> Signup and view all the answers

    What type of neurons innervate intrafusal fibers and are part of specialized stretch receptors?

    <p>Gamma motor neurons</p> Signup and view all the answers

    Which part of the brain initiates movement decisions and sends messages to lower motor neurons?

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

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