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Physiologic and anatomic basis for contralateral R 1 in blink reflex
Author(s) -
Soliven Betty,
Meer Jacob,
Uncini Antonino,
Petajan Jack,
Lovelace Robert
Publication year - 1988
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/mus.880110808
Subject(s) - corneal reflex , supraorbital nerve , stimulus (psychology) , anatomy , reflex , peripheral , trigeminal nerve , medicine , sensory system , anesthesia , neuroscience , psychology , psychotherapist
We studied the rate of appearance and mechanism of contralateral R 1 responses in normal subjects. Contralateral R 1 could be produced by facilitating maneuvers such as a gentle contraction of the orbicularis oculi and conditioning stimulus of the median nerve. In addition, changing the position of the stimulating anode to the midline evoked these responses that were abolished by blocking the contralateral supraorbital nerve, confirming its peperipheral origin. We conclude that crossed trigeminofacial pathways probably exist in normal subjects, but in some instances contralateral peripheral trigeminal ophthalmic sensory fibers may be stimulated, giving rise to a contralateral R 1 response.