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- W4387344559 abstract "Abstract The highly specialised masticatory apparatus of rodents raises interesting questions about how their skull withstands the intensive and sustained forces produced by biting on hard items. In these mammals, major systematics were explored for a long time based on the adductor muscles’ architecture and the related bony structures. The infraorbital foramen stands out, where a hypertrophied head of the zygomaticomandibular muscle passes through—in hystricomorphous rodents—as a direct consequence of the lateral and posterior shift of the preorbital bar . Interestingly, this bar moved laterally and backwards—enlarging the foramen—but it never disappeared throughout evolution, even showing morphological convergence among rodents. Previous research proposed this bar as behaving mechanically similar to the postorbital bar in ungulates, i.e., a safety structure against torsion stress while chewing. We analysed its morphology by mathematically modelling it under bending and torsion scenarios (linearly and elliptically shaped, respectively), and as for biting load propagation (catenary curve). Although the preorbital bar primarily seems to be shaped for withstanding torsional stress (as the postorbital bar in ungulates) and as an escaping point for force propagation, these forces are not a consequence of chewing and grinding foods, but preventing the zygomatic arch from failing when the powerful laterally‐displaced jaw adductor muscles are pulling the dentary upwards at biting." @default.
- W4387344559 created "2023-10-05" @default.
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- W4387344559 date "2023-10-04" @default.
- W4387344559 modified "2023-10-06" @default.
- W4387344559 title "Shape analysis of the preorbital bar in caviomorph rodents" @default.
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- W4387344559 doi "https://doi.org/10.1002/jmor.21646" @default.
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