THE facial nerve becomes paralysed more frequently than any btlier single nerve in the body, and yet the cause of this paralysis is in most cases unlknowna: In a certain small per. centage it is due to inflammation of tile -vall of its canal in thb bone, following on diseaase in tlhe middle ear; or to traunia, operative or otherwise. Rarely it is caused by a central lesion, or is part of a p9lyneuritis, being then often bilateral.
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Edward Moss (1922) studied this question.