Bite performance in clariid fishes with hypertrophied jaw adductors as deduced by bite modeling

2002 ◽  
Vol 253 (2) ◽  
pp. 196-205 ◽  
Author(s):  
Anthony Herrel ◽  
Dominique Adriaens ◽  
Walter Verraes ◽  
Peter Aerts
Keyword(s):  
Jaw Adductors

scholarly journals The Jaw Adductor Resultant and Estimated Bite Force in Primates

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Jonathan M. G. Perry ◽  
Adam Hartstone-Rose ◽  
Rachel L. Logan
Keyword(s):  
Temporomandibular Joint ◽  
Body Mass ◽  
Bite Force ◽  
Cross Sectional Area ◽  
Primate Species ◽  
Sectional Area ◽  
Cross Sectional ◽  
Joint Distraction ◽  
Jaw Adductors

We reconstructed the jaw adductor resultant in 34 primate species using new data on muscle physiological cross-sectional area (PCSA) and data on skull landmarks. Based on predictions by Greaves, the resultant should (1) cross the jaw at 30% of its length, (2) lie directly posterior to the last molar, and (3) incline more anteriorly in primates that need not resist large anteriorly-directed forces. We found that the resultant lies significantly posterior to its predicted location, is significantly posterior to the last molar, and is significantly more anteriorly inclined in folivores than in frugivores. Perhaps primates emphasize avoiding temporomandibular joint distraction and/or wide gapes at the expense of bite force. Our exploration of trends in the data revealed that estimated bite force varies with body mass (but not diet) and is significantly greater in strepsirrhines than in anthropoids. This might be related to greater contribution from the balancing-side jaw adductors in anthropoids.

Functional and Evolutionary significance of the recruitment and firing patterns of the jaw adductors during chewing in verreaux's sifaka (Propithecus verreauxi)

2011 ◽  
Vol 145 (4) ◽  
pp. 531-547 ◽  
Author(s):  
William L. Hylander ◽  
Christopher J. Vinyard ◽  
Christine E. Wall ◽  
Susan H. Williams ◽  
Kirk R. Johnson
Keyword(s):  
Evolutionary Significance ◽  
Propithecus Verreauxi ◽  
Firing Patterns ◽  
Jaw Adductors

scholarly journals The Jaw Adductors of Strepsirrhines in Relation to Body Size, Diet, and Ingested Food Size

2011 ◽  
Vol 294 (4) ◽  
pp. 712-728 ◽  
Author(s):  
Jonathan M.G. Perry ◽  
Adam Hartstone-Rose ◽  
Christine E. Wall
Keyword(s):  
Body Size ◽  
Food Size ◽  
Jaw Adductors

A dynamic model of mouth closing movements in clariid catfishes: the role of enlarged jaw adductors

2005 ◽  
Vol 234 (1) ◽  
pp. 49-65 ◽  
Author(s):  
Sam Van Wassenbergh ◽  
Peter Aerts ◽  
Dominique Adriaens ◽  
Anthony Herrel
Keyword(s):  
Dynamic Model ◽  
Jaw Adductors

scholarly journals The influence of jaw-muscle fibre-type phenotypes on estimating maximum muscle and bite forces in primates

2021 ◽  
Vol 11 (5) ◽  
pp. 20210009
Author(s):  
Megan Holmes ◽  
Andrea B. Taylor
Keyword(s):  
Adductor Muscle ◽  
Bite Force ◽  
Fibre Types ◽  
Muscle Forces ◽  
Cross Sectional ◽  
Average Maximum ◽  
Jaw Muscle ◽  
Cercocebus Atys ◽  
Fast Muscles ◽  
Jaw Adductors

Numerous anthropological studies have been aimed at estimating jaw-adductor muscle forces, which, in turn, are used to estimate bite force. While primate jaw adductors show considerable intra- and intermuscular heterogeneity in fibre types, studies generally model jaw-muscle forces by treating the jaw adductors as either homogeneously slow or homogeneously fast muscles. Here, we provide a novel extension of such studies by integrating fibre architecture, fibre types and fibre-specific tensions to estimate maximum muscle forces in the masseter and temporalis of five anthropoid primates: Sapajus apella ( N = 3), Cercocebus atys ( N = 4), Macaca fascicularis ( N = 3), Gorilla gorilla ( N = 1) and Pan troglodytes ( N = 2). We calculated maximum muscle forces by proportionally adjusting muscle physiological cross-sectional areas by their fibre types and associated specific tensions. Our results show that the jaw adductors of our sample ubiquitously express MHC α-cardiac, which has low specific tension, and hybrid fibres. We find that treating the jaw adductors as either homogeneously slow or fast muscles potentially overestimates average maximum muscle forces by as much as approximately 44%. Including fibre types and their specific tensions is thus likely to improve jaw-muscle and bite force estimates in primates.

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