Final answer:
The Glabellar reflex, also known as the Myerson sign, involves tapping the forehead to elicit a blink response, and its persistence in adults can suggest neurological dysfunction. It's related to reflex exams that check the functional status of neural pathways.
Step-by-step explanation:
The Glabellar reflex, also known as the Myerson sign, is not specifically described in the provided reference material; however, it is related to the neurological exam of reflexes. Similar to reflexes such as the Babinski sign and the corneal reflex, the Glabellar reflex can reveal the functional status of certain neural pathways. While the provided text focuses on the corneal reflex—which is triggered by stimulation of the cornea and results in blinking through the innervation of the orbicularis oculi muscle by the facial nerve—the Glabellar reflex is tested by tapping on the forehead between the eyebrows and observing a reflexive blink response. This reflex is typically present in newborns but diminishes with age; its persistence in adults can suggest neurological dysfunction. In a neurological exam, reflexes can indicate the integrity of lower motor neurons (LMN) and help to differentiate between upper and lower motor neuron disorders.