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Symphyseal morphology and jaw muscle recruitment levels during mastication in musteloid carnivorans. | LitMetric

AI Article Synopsis

Article Abstract

In studies of mammalian mastication, a possible relationship has been proposed between bilateral recruitment of jaw adductor muscle force during unilateral chewing and the degree of fusion of the mandibular symphysis. Specifically, species that have unfused, mobile mandibular symphyses tend to utilize lower levels of jaw adductor force on the balancing (nonchewing) than the working (chewing) side of the head, when compared to related species with fused symphyses. Here, we compare jaw adductor recruitment levels in two species of musteloid carnivoran: the carnivorous ferret (unfused symphysis), and the frugivorous kinkajou (fused symphysis). During forceful chewing, we observe that ferrets recruit far more working-side muscle force than kinkajous, regardless of food toughness and that high working-to-balancing side ratios are the result of increased working-side force, often coupled with reduced balancing-side force. We propose that in carnivorans, high working-to-balancing side force ratios coupled with an unfused mandibular symphysis are necessary to rotate the hemimandible for precise unilateral occlusion of the carnassial teeth and to sustain laterally oriented force on the jaw to engage the carnassial teeth during shearing of tough foods. In contrast, the kinkajou's flattened cheekteeth permit less precise occlusion and require medially-oriented forces for grinding, thus, a fused symphysis is mechanically beneficial.

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Source
http://dx.doi.org/10.1002/jez.2771DOI Listing

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