Lower Motor Neuron Lesion
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Questions and Answers

Which component is primarily responsible for the connection between the CNS and skeletal muscle contraction units?

  • Gamma motor neurons
  • Beta motor neurons
  • Interneurons
  • Alpha motor neurons (correct)
  • What type of atrophy is caused by damage to the nervous system?

  • Ischemic atrophy
  • Hypertrophic atrophy
  • Disuse atrophy
  • Neurogenic atrophy (correct)
  • Which condition is characterized by quick twitches of muscle fibers visible on the surface of the skin?

  • Fibrillations
  • Spasms
  • Fasciculations (correct)
  • Hypertonia
  • What is the term used to describe abnormally low resistance to passive stretch?

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

    What symptom is typically not visible except in the tongue?

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

    What does flaccidity indicate in terms of muscle resistance?

    <p>Lack of resistance to passive stretch</p> Signup and view all the answers

    What is the primary responsibility of the pyramidal system with regards to lower motor neurons (LMNs)?

    <p>To carry cortical commands to LMNs for executing voluntary movements.</p> Signup and view all the answers

    Which part of the central nervous system do lower motor neurons primarily influence to achieve voluntary movement?

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

    Where are the cell bodies of lower motor neurons located?

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

    What type of neuron must be intact for normal voluntary movements, according to the lecture?

    <p>Both upper and lower motor neurons</p> Signup and view all the answers

    Through which route do upper motor neurons send impulses to lower motor neurons?

    <p>Through descending tracts to synapse with lower motor neurons or interneurons</p> Signup and view all the answers

    From where do the anterior horn cells (AHCs) receive motor impulses?

    <p>Pyramidal tract</p> Signup and view all the answers

    What influences fine-tuning coordination during movement?

    <p>Cerebellum connections with motor cortex and brainstem motor centers</p> Signup and view all the answers

    What functional role do muscle receptors play during the execution of movement?

    <p>They record muscle stretch and send information back to LMNs and cerebellum.</p> Signup and view all the answers

    What is the primary function of alpha motor neurons?

    <p>To innervate extrafusal muscle fibers</p> Signup and view all the answers

    Where are the cell bodies of lower motor neurons located?

    <p>Ventral horn of the spinal cord</p> Signup and view all the answers

    What type of axons do gamma motor neurons have?

    <p>Medium-sized myelinated axons</p> Signup and view all the answers

    Which of the following is true about intrafusal muscle fibers?

    <p>They are innervated by gamma motor neurons</p> Signup and view all the answers

    Which type of neuron is primarily responsible for regulating muscle tone?

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

    What happens when an alpha motor neuron releases sufficient ACh?

    <p>All of the muscle fibers it innervates contract</p> Signup and view all the answers

    What is the primary role of the motor nuclei of cranial nerves?

    <p>To form the cell bodies of LMN for the cranial nerves</p> Signup and view all the answers

    Which pathway do the axons of alpha and gamma motor neurons follow to reach skeletal muscle?

    <p>Ventral root, spinal nerve, peripheral nerve</p> Signup and view all the answers

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