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(Investigative Ophthalmology and Visual Science. 1972;11:970-979.)
© 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

II. Muscle Spindles

DAVID W. HARKER 1

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

The structure, innervation, and distribution of muscle spindles in sheep superior rectus and levator palpebrae superioris muscles are compared. In superior rectus, about 180 spindles are peripherally distributed throughout the length of the muscle. The ultrastructure, histochemical profile, and innervation of the nuclear-bag and nuclear-chain muscle fibers are the same as the extrafusal peripheral grape-innervated (G) and plate-innervated (C) fiber types, respectively. Motor innervation is collateral and segregated. Grape innervation is distributed to the bag fibers, and plate innervation to the chains. Levator palpebrae has about 60 spindles evenly distributed throughout the muscle. The nuclear-bag fibers correspond histochemically and ultrastructurally to the bag fibers of superior rectus, and also receive a grape motor innervation, though in this case it is purely fusimotor. The nuclear-chain fibers correspond to those of superior rectus, and receive a similar plate innervation. Sheep spindles receive both a primary and a secondary sensory innervation.

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




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