Motor Pathways

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1. 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
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2. Which of these is not a function of the descending motor pathways?

  • To alter the strength of reflexes
  • To transmit sensory information to the cerebral cortex
  • To activate motor units

3. 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

4. Which of these is false when considering lateral descending motor pathways?

  • They have a greater effect on extensors than flexors
  • They descend in the contralateral lateral funiculus
  • The terminations are focused on contralateral lateral interneurones and motorneurones
  • They have a function in fine, independent dexterity
  • They control muscle groups in the limbs, mainly the distal parts

5. Which of these is not a way in which motor units can be activated?

  • Spontaneously
  • Descending motor pathways
  • Cranial nerve reflexes
  • Spinal nerve reflexes


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