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

What symptom is typically not visible except in the tongue?

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

What does flaccidity indicate in terms of muscle resistance?

<p>Lack of resistance to passive stretch (C)</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. (A)</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 (A)</p> Signup and view all the answers

Where are the cell bodies of lower motor neurons located?

<p>Spinal cord or brainstem (A)</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 (C)</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 (D)</p> Signup and view all the answers

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

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

What influences fine-tuning coordination during movement?

<p>Cerebellum connections with motor cortex and brainstem motor centers (D)</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. (A)</p> Signup and view all the answers

What is the primary function of alpha motor neurons?

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

Where are the cell bodies of lower motor neurons located?

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

What type of axons do gamma motor neurons have?

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

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

<p>Gamma motor neurons (D)</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 (A)</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 (C)</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 (C)</p> Signup and view all the answers

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