Histological and histochemical characterisation of the equine soft palate muscles

Equine Veterinary Journal
C S HawkesP M Dixon

Abstract

Dysfunction of the muscles is implicated in the pathogenesis of intermittent dorsal displacement of the soft palate (DDSP) in exercising horses. The histological features of normal equine soft palate muscles have not been previously described. To describe the histological and morphometric features of normal equine soft palate muscles. The palatinus, palatopharyngeus, levator veli palatini and tensor veli palatini muscles of 6 Thoroughbred type horses were examined histologically and histochemically to assess their general morphology, fibre-type distribution and mean fibre diameter. The muscles of all 6 specimens showed very similar characteristics, including a low proportion of type 1 muscle fibres in the 4 different muscles examined, with the 3 muscles innervated by the pharyngeal branch of the vagus (i.e. palatopharyngeus, palatinus and levator veli palatini) having significantly fewer (P<0.005) type 1 muscle fibres compared to the tensor veli palatini. The mean fibre diameters were significantly (P<0.05) smaller in type 1 than type 2 fibres in all muscles except the palatinus. Considerable variability in mean fibre size diameter was evident in all muscles examined, with type 1 fibres in the levator veli palatini and rostral ...Continue Reading

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Citations

Nov 1, 1993·Equine Veterinary Journal·C Lopez-PlanaJ Ruberte
Jun 3, 2011·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Silvana ArrighiStefano Romussi

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