Upper and Lower Motor Neurons Pathway Quiz

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Questions and Answers

Which condition is characterized by a decrease in muscle size due to Motor Neuron lesions?

  • Spinal muscular atrophy
  • Amyotrophic lateral sclerosis (correct)
  • West Nile virus
  • Multiple sclerosis

What specific type of upper motor lesion is produced by damage to the corticobulbar pathway?

  • Diabetic neuropathy
  • Guillain-Barre syndrome
  • Cauda equina syndrome
  • Pseudobulbar palsy (correct)

What is the most common cause of acute flaccid neuromuscular paralysis?

  • B12 deficiency
  • Botulinum toxin (Botulism) (correct)
  • Fredericks ataxia
  • Polio myelitis

What is the function of upper motor neurons?

<p>Transmit information from the brain to the skeletal muscles (A)</p> Signup and view all the answers

Where do the majority of upper motor neurons reside?

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

What is the role of lower motor neurons?

<p>Transmit information from the brain to the skeletal muscles (B)</p> Signup and view all the answers

Where do some of the motor neurons that project to proximal muscles travel through before crossing over in the spinal cord?

<p>Red nucleus of midbrain (C)</p> Signup and view all the answers

Which type of motor neurons are subdivided into alpha, beta, and gamma motor neurons?

<p>Somatic motor neurons (B)</p> Signup and view all the answers

A lesion of the corticobulbar tract can result in what condition?

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

Which system is responsible for voluntary movement?

<p>Pyramidal system (D)</p> Signup and view all the answers

In the pyramidal system, what are the important tracts for voluntary movement?

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

Which cranial nerve nuclei connect to the Nucleus Ambiguus?

<p>Cranial nerve IX (glossopharyngeal nerve) (C)</p> Signup and view all the answers

Where do upper motor neurons from the right primary motor cortex pass through on their way to target organs?

<p>Internal capsule (D)</p> Signup and view all the answers

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