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Mandibular corpus bone strain in goats and alpacas: implications for understanding the biomechanics of mandibular form in selenodont artiodactyls.

Publication ,  Journal Article
Williams, SH; Vinyard, CJ; Wall, CE; Hylander, WL
Published in: Journal of anatomy
January 2009

The goal of this study is to clarify the functional and biomechanical relationship between jaw morphology and in vivo masticatory loading in selenodont artiodactyls. We compare in vivo strains from the mandibular corpus of goats and alpacas to predicted strain patterns derived from biomechanical models for mandibular corpus loading during mastication. Peak shear strains in both species average 600-700 microepsilon on the working side and approximately 450 microepsilon on the balancing side. Maximum principal tension in goats and alpacas is directed at approximately 30 degrees dorsocaudally relative to the long axis of the corpus on the working side and approximately perpendicular to the long axis on the balancing side. Strain patterns in both species indicate primarily torsion of the working-side corpus about the long axis and parasagittal bending and/or lateral transverse bending of the balancing-side corpus. Interpretation of the strain patterns is consistent with comparative biomechanical analyses of jaw morphology suggesting that in goats, the balancing-side mandibular corpus is parasagittally bent whereas in alpacas it experiences lateral transverse bending. However, in light of higher working-side corpus strains, biomechanical explanations of mandibular form also need to consider that torsion influences relative corpus size and shape. Furthermore, the complex combination of loads that occur along the selenodont artiodactyl mandibular corpus during the power stroke has two implications. First, added clarification of these loading patterns requires in vivo approaches for elucidating biomechanical links between mandibular corpus morphology and masticatory loading. Second, morphometric approaches may be limited in their ability to accurately infer masticatory loading regimes of selenodont artiodactyl jaws.

Duke Scholars

Published In

Journal of anatomy

DOI

EISSN

1469-7580

ISSN

0021-8782

Publication Date

January 2009

Volume

214

Issue

1

Start / End Page

65 / 78

Related Subject Headings

  • Stress, Mechanical
  • Mastication
  • Mandible
  • Male
  • Goats
  • Female
  • Camelids, New World
  • Bite Force
  • Animals
  • Anatomy & Morphology
 

Citation

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ICMJE
MLA
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Williams, S. H., Vinyard, C. J., Wall, C. E., & Hylander, W. L. (2009). Mandibular corpus bone strain in goats and alpacas: implications for understanding the biomechanics of mandibular form in selenodont artiodactyls. Journal of Anatomy, 214(1), 65–78. https://doi.org/10.1111/j.1469-7580.2008.01008.x
Williams, Susan H., Christopher J. Vinyard, Christine E. Wall, and William L. Hylander. “Mandibular corpus bone strain in goats and alpacas: implications for understanding the biomechanics of mandibular form in selenodont artiodactyls.Journal of Anatomy 214, no. 1 (January 2009): 65–78. https://doi.org/10.1111/j.1469-7580.2008.01008.x.
Williams, Susan H., et al. “Mandibular corpus bone strain in goats and alpacas: implications for understanding the biomechanics of mandibular form in selenodont artiodactyls.Journal of Anatomy, vol. 214, no. 1, Jan. 2009, pp. 65–78. Epmc, doi:10.1111/j.1469-7580.2008.01008.x.
Journal cover image

Published In

Journal of anatomy

DOI

EISSN

1469-7580

ISSN

0021-8782

Publication Date

January 2009

Volume

214

Issue

1

Start / End Page

65 / 78

Related Subject Headings

  • Stress, Mechanical
  • Mastication
  • Mandible
  • Male
  • Goats
  • Female
  • Camelids, New World
  • Bite Force
  • Animals
  • Anatomy & Morphology