Newborn Reflexes

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http://youtube.com/watch?v=Lt-1AZpSVug

Glabellar Reflex aka Myerson’s Sign #reflexpathway #cranialnerves #positive #afferentpathway • Watch this procedure, learn and see what is this reflex? • Finding this abnormal reflex is not very common. • It is a non-focal Orbicularis oculi reflex. • aka supraorbital, trigeminofacial, McCarthy’s, or nasopalpebral reflex, Myerson’s sign . • Procedure: • First of all, stand on the side of the patient. • Tapping should be done with the reflex hammer/finger from above • to avoid eliciting the blink reflex to threat. • Tapping over outer aspect of supraorbital ridge, over glabella, or around orbital margin; • It can sometimes be elicited by tapping the forehead as far back as the hairline. • Response: • Tapping causes eyes to blink. • Normally,the adult patient habituated to the stimulus and ceases blinking after a few taps. • If blinking persists,it is abnormal. • Reflex arc: • The afferent sensory signals are transmitted by the trigeminal nerve to the brain stem. • The efferent signal goes to the orbicularis oculi muscle via the facial nerve, causing the muscle to reflexively contract ,yielding blinking. • Significance: • It is one of the frontal release signs . • It is normal in infants, disappear with brain maturation allowing inhibition. • This primitive reflex reappears in disorders that affect frontal lobes.

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