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Primitive Reflexes

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Topic updated on 10/15/16 8:41am

Overview
  • Normally disappear within 1st year of life
    • may reemerge following frontal lobe lesion (due to disinhibition of reflexes)
  • Examples
    • Moro reflex
    • rooting reflex
    • sucking reflex
      • sucking response when roof of mouth is touched
    • plantar reflex
      • dorsiflexion of large toe and fanning of other toes with stimulation of sole
      • presence of this reflex in adult suggests UMN lesion (Babinski sign)
    • palmar reflex
      • curling of fingers if palm is stroked
    • glabellar reflex
      • tapping between eyebrows causes blinking response (to protect eyes from potential threat)
      • uninhibited blinking after stimulation in adult suggests frontal lobe lesion and is particularly common in Parkinson's disease (Myerson's sign)


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