Muscular design in the equine interosseus muscle

Journal of Morphology
Carl Soffler, John W Hermanson

Abstract

We studied the forelimb interosseus muscle in horses, Equus caballus, to determine the muscular properties inherent in its function. Some authors have speculated that the equine interosseus contains muscle fibers at birth only to undergo loss of these fibers through postnatal ontogeny. We describe the muscle fibers in eight interosseus specimens from adult horses. These fibers were studied histochemically using myosin ATPase studies and immunocytochemically using several antibodies directed against type I and type II myosin heavy chain antibodies. We determined that 95% of the fibers were type I, presumed slow-twitch fibers. All fibers exhibited normal morphological appearance in terms of fiber diameter and cross-sectional area, suggesting that the muscles are undergoing normal cycles of recruitment. SDS-PAGE studies of myosin heavy chain isoforms were consistent with these observations of primarily slow-twitch muscle. Fibers were determined to be approximately 800 microm long when studied using nitric acid digestion protocols. Short fiber length combined with high pinnation angles suggest that the interosseus muscle is able to generate large amounts of force but can produce little work (measured as pulling the distal tendon pr...Continue Reading

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Citations

Aug 13, 2010·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·M T ButcherJ E A Bertram
May 17, 2013·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·A Lempe-TroilletJ Edinger
Oct 20, 2012·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Janina BurkWalter Brehm
Feb 16, 2012·Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association·Michael SchrammeKeith Linder
Sep 5, 2006·The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology·Ron A Meyers, John W Hermanson
Jun 15, 2019·Animals : an Open Access Journal From MDPI·Sharon May-DavisWendy Y Brown
Jan 13, 2021·Proceedings. Biological Sciences·Jamie A MacLaren
Apr 3, 2021·Integrative Organismal Biology·A M MossorM T Butcher

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