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A Geometric Morphometric Study on the Rat Mandible.

İftar Gürbüz1, Yasin Demiraslan2

  • 1Department of Anatomy, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey.

Anatomia, Histologia, Embryologia
|December 21, 2024
PubMed
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The shape of the Wistar albino rat mandible differs between genders, particularly in specific processes. Geometric morphometrics revealed distinct shape characteristics allowing for gender discrimination.

Area of Science:

  • Comparative anatomy
  • Morphology
  • Biometrics

Background:

  • Understanding skeletal morphology is crucial in biological research.
  • Wistar albino rats are a common model organism for physiological and anatomical studies.
  • Sexual dimorphism in skeletal structures can impact research findings.

Purpose of the Study:

  • To investigate sexual dimorphism in the shape of the Wistar albino rat mandible.
  • To utilize geometric morphometrics to analyze mandibular shape variations.
  • To determine if mandibular shape can be used for gender discrimination in rats.

Main Methods:

  • Geometric morphometrics applied to lateral view photographs of 52 Wistar albino rat mandibles (31 female, 21 male).
  • Marking of 16 landmarks on each mandible.
Keywords:
gendergeometric morphometrymandibleratshape

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  • Analysis using principal component analysis (PCA) and discriminant function analysis via MorphoJ software.

    • Main Results:

    • Principal component analysis identified shape changes primarily in the mandibular ramus.
    • No significant shape change was observed at the ventral edge of the mandible.
    • Cross-validation indicated successful gender grouping (77% female, 80% male) based on mandibular shape, with differences noted in condylar, coronoid, and angular processes.

    Conclusions:

    • The study successfully characterized the lateral shape of the Wistar albino rat mandible.
    • Significant gender-based shape differences exist, particularly in the mandibular processes.
    • Mandibular shape analysis provides a reliable method for gender discrimination in this rat model.