Motor Pathways

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1. Which of these is false when considering medial descending motor pathways?

  • The main origin is the primary motor cortex
  • They descend in the ventral funiculus
  • They have an anti-gravity function
  • The control muscles groups in the neck, trunk and proximal limbs
  • The terminations of this system are bilateral and widely dispersed
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2. The stretch reflex is a?

  • Postural reflex
  • Protective reflex

3. Action potentials fired by 1a muscle spindle fibres increases when?

  • The muscle spindle fibre is being stretched
  • As the length of the muscle spindle fibre increases

4. A stroke affecting the medial descending motor pathways will have?

  • Little effect because the pathways have bilateral terminations
  • A large effect because the terminations are contralateral

5. Rhythmic movements, such as locomotion or chewing, are produced by?

  • Descending motor pathways
  • Central pattern generators (CPGs)
  • All three
  • Cranial nerve and spinal nerve reflexes


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