Parkinson's Exam
 

Glabellar Reflex

 
 
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Overview

    • How to Elicit

    • Percuss repeatedly between the eyebrows, looking for reactive blinking.
    • Interpretation

    • Decreased - no blinking in response to stimulusOphthalmic nerve (V1) / facial nerve (VII) palsy, pons / medullary lesion
    • Normal - up to five blinks and then no further blinking following habitualization
  • The glabellar reflex is a primitive reflex - normally present in infants and absent in adults. In the case of frontal lobe damage, ‘frontal release' signs such as glabellar, grasp, suck, snout and palmomental reflexes will be present.
 
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