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II. Muscle Palsies

GOODWIN M. BREININ, M.D.

AMA Arch Ophthalmol. 1957;57(2):165-175.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Electromyography (EMG) of the extraocular muscles has afforded insight into innervational patterns of common and uncommon diseases affecting ocular motility. The method has been described previously.^1,2 The following applications are of particular interest.

A. Neurogenic Palsies of Extraocular Muscles

1. Third, fourth, and sixth nerve palsies are frequently encountered in ophthalmological and neurological practice. It is of diagnostic and prognostic importance to establish the site and character of the lesion. Electromyography has an important role to play in such studies. The following observations considerably amplify the findings of Bjork.³ The presence of lower motor neuron denervation may be determined. The cardinal sign of denervation is fibrillation—the minute discharge of single muscle fiber potentials which occur spontaneously without relation to volition and indicate lower motor neuron damage. Characteristic fibrillations have been noted in oculomotor palsies.¹ Caution is necessary in the interpretation of ocular muscle potentials, since small, single . . . [Full Text PDF of this Article]

Author Affiliations
New York

From the Department of Ophthalmology of the New York University Post-Graduate Medical School.

Footnotes
Received for publication June 19, 1956.

Presented before the New England Ophthalmological Society, Boston, Feb. 15, 1956.

Studies conducted under Grant B-911 of the National Institute of Neurological Diseases and Blindness and under grants from the National Council to Combat Blindness and the Stanley Tausend Foundation.

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