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The jaw adductor resultant and estimated bite force in primates
Jonathan M G Perry1, Adam Hartstone-Rose, Rachel L Logan
1Department of Anatomy, Midwestern University, 555 31st Street, Downers Grove, IL 60515, USA.
Anatomy Research International
|May 22, 2012
Summary
Primate jaw adductor resultant forces do not match predictions, lying further back and inclining more anteriorly in folivores. Bite force varies with body mass, not diet, and is higher in strepsirrhines than anthropoids.
Area of Science:
- Biomechanics
- Primate Anatomy
- Paleontology
Background:
- Understanding jaw adductor resultant forces is crucial for reconstructing feeding mechanics in primates.
- Previous models predicted specific locations and inclinations for the jaw adductor resultant based on functional demands.
Purpose of the Study:
- To reconstruct the jaw adductor resultant in 34 primate species.
- To compare these reconstructions with existing biomechanical predictions.
- To investigate trends in bite force and its relation to diet, body mass, and primate infraorders.
Main Methods:
- Reconstruction of jaw adductor resultant using muscle physiological cross-sectional area (PCSA) data.
- Analysis of skull landmarks in 34 primate species.
- Statistical analysis of bite force variation with body mass, diet, and taxonomic groups.
Main Results:
- The jaw adductor resultant was found to lie significantly posterior to its predicted location and the last molar.
- A significantly more anterior inclination of the resultant was observed in folivorous primates compared to frugivorous ones.
- Estimated bite force correlated with body mass but not diet, and was significantly greater in strepsirrhines than anthropoids.
Conclusions:
- Primate jaw biomechanics may prioritize temporomandibular joint stability and gape over maximal bite force.
- Dietary adaptations do not directly predict bite force; instead, body mass and infraordinal differences play a significant role.
- Differences in jaw adductor muscle contributions between strepsirrhines and anthropoids may explain variations in bite force.
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