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Motor Excitation and Inhibition In Internuclear PalsyAn Electromyographic Study
JOHN D. LOEFFLER, MD;
WILLIAM F. HOYT, MD;
BERNARD SLATT, MD
Arch Neurol. 1966;15(6):664-671.
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| Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings. |
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INTERNUCLEAR ophthalmoplegia is the hallmark of a lesion in the paramedian pontine tegmentum.1-3 It implies distinctive disturbances in patterns of ocular motor innervation. Electromyography (EMG) was used in six patients with acute and chronic internuclear ophthalmoplegia to display and analyze these altered patterns of motor excitation and inhibition during various types of horizontal gaze. All were patients at the University of California San Francisco Medical Center.
Method
Conjunctival topical anesthesia was used. Fine concentric needle electrodes were inserted into the involved medial rectus (MR) and one or more of the other three horizontal rectus muscles and were gently manipulated until the recording tips were securely within the belly of the muscle. The electronic system used for recordings from these muscles is standard for EMG and has been described previously.4
Several types of horizontal eye movements were studied: (1) following movements to the extremes of lateral gaze, (2)
. . . [Full Text PDF of this Article]
Author Affiliations
SAN FRANCISCO
From the Division of Neurological Surgery and the Department of Ophthalmology, University of California San Francisco Medical Center, San Francisco. Dr. Loeffler is in private practice in Modesto, Calif; Dr. Slatt is in private practice in Toronto.
Footnotes
Submitted for publication Aug 8, 1966; accepted Aug 25.
Reprint requests to Division of Neurological Surgery, University of California San Francisco Medical Center, Parnassus and Third, San Francisco 94122 (Dr. Hoyt).
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