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A quantitative study of the equine soft palate using histomorphometry.

Lucy E Richardson1, Glenn K Wakley, Samantha H Franklin

  • 1Department of Anatomy, University of Bristol, School of Veterinary Science, Southwell Street, Bristol BS2 9EJ, UK.

Veterinary Journal (London, England : 1997)
|June 15, 2006
PubMed
Summary

Understanding the normal equine soft palate structure is key to investigating dorsal displacement of the soft palate in horses. This study details the soft palate

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Area of Science:

  • Equine anatomy and physiology
  • Veterinary science
  • Respiratory system disorders

Background:

  • Dorsal displacement of the soft palate (DDSP) is a common cause of upper airway obstruction in racehorses.
  • The etiology of DDSP remains largely unknown.
  • Understanding the normal structure of the equine soft palate is essential for investigating potential structural causes of DDSP.

Purpose of the Study:

  • To qualitatively and quantitatively describe the normal structure of the equine soft palate using histomorphometry.
  • To provide a baseline for comparison in studies investigating DDSP.
  • To identify potential structural factors contributing to DDSP.

Main Methods:

  • Histomorphometric analysis of soft palate tissue samples from 12 Thoroughbred horses.

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  • Qualitative description of tissue types and their distribution.
  • Quantitative assessment of glandular tissue, muscle, epithelium, and elastin fiber distribution.

    • Main Results:

    • Glandular tissue constituted approximately 40% of the total soft palate area, predominantly in rostral and ventral regions.
    • Muscle abundance was highest in the dorsal mid-region and decreased caudally.
    • The oral mucosa was non-keratinized stratified squamous epithelium, while the nasopharyngeal mucosa was pseudostratified, columnar, and ciliated.
    • Elastin fibers were present in the nasopharyngeal submucosa, increasing in prevalence caudally.
    • The equine soft palate exhibited bilateral symmetry, but significant individual variation in tissue proportions was noted.

    Conclusions:

    • The equine soft palate has a complex structure with a predominance of glandular tissue.
    • Variations in tissue composition and distribution may play a role in the susceptibility to dorsal displacement.
    • Further research is warranted to correlate specific structural characteristics with the occurrence of DDSP in horses.