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Blink Reflex Lab Report

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Overend (1896) , described for the first time that a gentle tap on the forehead evoked a reflex reponse from the orbicularis oculi muscles: the BR (as quoted by Ellrich, 2000) (23).The blink reflex (BR) is a protective, physiological trigemino-facial brainstem reflex aiming toat facilitate eyelid closure as a response to a potentially harmful and threatening stimulus. It consists of bilateral eyelid closure in response to a stimulus applied in the area innervated by the trigeminal nerve or directly on a branch of the trigeminal nerve. In routine clinical practice the BR can be elicited when the skin innervated by the supraorbital nerve is stimulated and a compound muscle action potential from the surface of the orbicularis oculi muscle is …show more content…
K. (1995), he evaluated the blink reflex with stimulation of the distribution of the mental nerve and obtained reflex reference values. The effects of the stimulation site, the size of the stimulating electrode, and facilitation by eye closure and mathematical task on the mental nerve blink reflex responses were tested in 44 healthy adults. A small paediatric stimulating electrode was found to be efficient for dermatomal stimulation of the mental nerve distribution. The mental nerve blink reflex responses consisted of an ipsilateral late component (R2i) on the side of the stimulation and a contralateral component (R2c) with similar latency. The mental nerve blink reflex onset latencies were longer and the stimulation thresholds needed to produce a reflex response were higher with stimulation of the, when compared with those of supraorbital nerve stimulation. Eye closure resulted in facilitation of the mental nerve blink reflex in the form of latency shortening. Jaaskelainen, concluded that a reproducible constant and stable mental nerve blink reflex responses can be elicited in healthy adults, which enables further clinical application and utility of this …show more content…
Mental nerve blink reflex test was found to be useful in the diagnosis of iatrogenic inferior alveolar nerve damage after surgical impaction of third molars, and after orthognathic mandibular operations. It also proved to be useful in the diagnosis and follow-up of sensory impairment of the inferior alveolar nerve in patients underwent such surgery of the mandible. A retained normal mental nerve blink reflex responses within 2 months after operation indicated a reasonably good sensory recovery (70).
1.3.1.3. Nociceptive blink

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