Muscle fiber compartmentalization in the gluteus medius of the horse
AuthorBruce, Virginia Lee, 1950-
AdvisorSchurg, William A.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractMuscle fiber architecture, innervation, and differences in fiber-type composition were examined in the gluteus medius of four horses. In the anatomical part of this study, the gluteus medius of four adult horses were extracted, soaked in a 10% formalin solution, and examined for fiber architecture and innervation patterns. Based on architectural and innervation differences, two distinct anatomical compartments were defined: the dorsal region and the ventral region. The histochemical portion of this study examined the fiber composition of each region by classifying the fiber types on the basis of myosin-ATPase. The dorsal region had a significantly higher percentage of Type I fibers than the ventral region; whereas the ventral region had a significantly higher percentage of Type IIB fibers than the dorsal region. These findings suggest that this subdivided structure may be designed to allow functional independence within the muscle.