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Studies of the Facial Nerve and the Blink Reflex 

Studies of the Facial Nerve and the Blink Reflex
Chapter:
Studies of the Facial Nerve and the Blink Reflex
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0008
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date: 16 September 2021

This chapter discusses studies of the facial and trigeminal nerves together with the blink reflex. Surface stimulation of the facial nerve as it exits from the stylomastoid foramen or more distally gives rise to compound muscle action potentialin various facial muscles on the same side. Electrical stimulation of the supraorbital nerve elicits two or more temporally separate responses of the orbicularis oculi muscles, an ipsilateral early component (R1) via a short latency pontine pathway and bilateral late component (R2) through a complex route, which includes the pons, lateral medulla, and reticular formation. Of the two, R1 serves as a more reliable measure of nerve conduction along the reflex pathway, whereas R2 helps localize the lesion to the afferent or efferent reflex arc.

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