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KENSEI CHENG, MD; GOODWIN M. BREININ, MD

Arch Ophthalmol. 1965;74(6):822-834.

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

Introduction

Recent electron microscopic studies have demonstrated the presence of two distinct types of muscle fiber, Fibrillenstruktur and Felderstruktur,¹ in the extraocular muscles of guinea pig,² cat,³ and man.⁴ In the Fibrillenstruktur fibers, the myofibrils have a punctate appearance, and the sarcoplasmic reticulum surrounds clearly the individual fibrils. The Felderstruktur fibers, on the other hand, have larger myofibrils which are not regularly separated from each other and appear to be fused together. Physiologically, the Fibrillenstruktur fibers appear to be associated with relatively rapid twitch responses, whereas the Felderstruktur fibers respond to stimulation with prolonged contracture.³

There are, in addition, two kinds of nerve endings in the extraocular muscles which can be histochemically differentiated by cholinesterase staining; these are the "en plaque" and "en grappe" endings.^2-7 The "en plaque" endings stain intensely and show the same configuration as the subneural apparatus of motor end-plates in . . . [Full Text PDF of this Article]

Author Affiliations
New York

From the Department of Ophthalmology, New York University Medical Center, New York.

Footnotes
Submitted for publication May 21, 1965.

Reprint requests to Department of Ophthalmology, New York University Medical Center, 550 First Avenue, New York 10016 (Dr. Cheng).

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