The distribution of muscle weakness and the presence of hyperactive tendon reflexes is consistent with pyramidal tract disease. Tapping the patella tendon elicits a reflex contraction of the quadriceps muscle. Which of the following occurs during the contraction of the quadriceps muscle?

A 43-year-old woman has a chief complaint of muscle weakness. The distribution of muscle weakness and the presence of hyperactive tendon reflexes is consistent with pyramidal tract disease. Tapping the patella tendon elicits a reflex contraction of the quadriceps muscle. Which of the following occurs during the contraction of the quadriceps muscle?

  • A. The α-motoneurons innervating the extrafusal muscle fibers decrease their rate of firing
  • B. The α-motoneurons to the antagonistic muscles increase their rate of firing
  • C. The γ-motoneurons innervating the intrafusal muscle fibers increase their rate of firing
  • D. The Ia afferents from the muscle spindle increase their rate of firing
  • E. The Ib afferents from the Golgi tendon organ increase their rate of firing

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