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(Investigative Ophthalmology and Visual Science. 1972;11:956-969.)
© 1972 by The Association for Research in Vision and Ophthalmology, Inc.

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The Structure and Innervation of Sheep Superior Rectus and Levator Palpebrae Extraocular Muscles

I. Extrafusal Muscle Fibers

DAVID W. HARKER 1

1 Department of Zoology, University of Durham, Durham, England

The structure and innervation of the extrafusal muscle fibers in sheep superior rectus and levator palpebrae superioris muscles are compared. Levator palpebrae is composed of three plate-innervated types of ‘twitch’ fiber, the ‘slowest’ of which is not represented in superior rectus. Superior rectus is organized into three layers: A central core of mainly large-diameter fibers contains three plate-innervated types of ‘twitch’ fiber, with 7 per cent large-diameter grape-innervated fibers; an orbital rim of small-diameter fibers contains mainly plate-innervated ‘twitch’ fibers, together with a third of small-diameter grape-innervated fibers; and a thin peripheral patch at either end of the muscle is composed mainly of intermediate-diameter grape-innervated fibers. Muscle spindles are peripherally distributed in the orbital rim and peripheral patch layers. The functional significance of the histochemical and ultrastructural characteristics of the fiber types is discussed.

Submitted on June 5, 1972
Accepted on September 21, 1972




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