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Trigemino‐facial reflex inhibitory responses in some lower facial muscles
Author(s) -
Pavesi Giovanni,
Macaluso Guido Maria,
Marchetti Paola,
Cattaneo Luigi,
Tinchelli Stefano,
De Laat Antoon,
Mancia Domenico
Publication year - 2000
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/(sici)1097-4598(200006)23:6<939::aid-mus15>3.0.co;2-7
Subject(s) - facial muscles , corneal reflex , inhibitory postsynaptic potential , reflex , anatomy , electromyography , facial nerve , stimulation , medicine , orbicularis oris muscle , orbicularis oculi muscle , excitatory postsynaptic potential , trigeminal nerve , silent period , anesthesia , ophthalmology , physical medicine and rehabilitation , transcranial magnetic stimulation , upper lip , eyelid
The effects of electrical trigeminal stimulation on activated facial muscles were studied in 20 normal subjects in order to evaluate whether excitatory or inhibitory responses are present and to investigate whether the reflex organization is similar in all the facial muscles. No inhibition was observed in frontalis, orbicularis oculi, orbicularis oris, and mentalis muscles. By contrast, a clear suppression of electromyographic (EMG) activity (late silent period or SP2) was present in the levator labii superioris, depressor anguli oris, and depressor labii inferioris muscles, with a mean latency ranging from 41.8 to 50.2 ms, and a mean duration ranging from 27.5 to 40.9 ms. An early suppression of EMG activity (early silent period or SP1) was observed, with a latency of 16 to 20 ms and a duration of 10 ms, mainly in inferior perioral muscles. Our findings show a selective trigeminal inhibitory influence upon some specific lower facial muscles. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 939–945, 2000