Experimental facial myokymia in cat.

Abstract:

INTRODUCTION:The objective of this study was to describe facial myokymia in experimental animals accompanying kainic acid affects on facial motor neurons. MATERIAL & METHODS:Anesthetized cats were injected with kainic acid into the pons adjacent to the facial nucleus. Facial movements appeared shortly after the injections and facial electromyographic potentials were recorded. Cats were killed up to 4 weeks later, the brainstems were processed histologically, and the number of neurons in the facial nucleus counted. RESULTS:Cats receiving injection of kainic acid adjacent to facial nucleus all developed spontaneous writhing movements of the face ipsilateral to the injection site, clinically resembling facial myokymia in humans. Transient facial paresis, lasting several weeks, appeared in some of the cats. Facial myokymia occurred independent of histological evidence of neuronal loss in facial nucleus, whereas facial paresis occurred in all but one of the animals with significant neuronal loss in the facial nucleus. Placing a needle into the superior olive without injecting kainic acid or injections of kainic acid into cochlear nucleus was not accompanied by facial myokymia or subsequent facial paresis. CONCLUSION:Facial movements in cats similar to myokymia in humans accompanies kainic acid injections adjacent to the nucleus of the facial nerve.

journal_name

Acta Neurol Scand

authors

Zaaroor M,Starr A

doi

10.1111/j.1600-0404.1997.tb00062.x

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

19-22

issue

1

eissn

0001-6314

issn

1600-0404

journal_volume

95

pub_type

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