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Feedback control from the jaw joints during biting: An investigation of the reptile Sphenodon using multibody modelling
Authors:N Curtis  MEH Jones  SE Evans  P O’Higgins  MJ Fagan
Institution:1. Department of Engineering, University of Hull, Hull, HU6 7RX, United Kingdom;2. Research Department of Cell and Developmental Biology, Gower Street, UCL, University College London, London, WCIE 6BT, United Kingdom;3. The Hull York Medical School, University of York, York, YO10 5DD, United Kingdom;1. División Antropología, Museo de La Plata, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900, La Plata, Buenos Aires, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina;3. Laboratorio de Neuroimágenes, Departamento de Imágenes, Instituto de Investigaciones Neurológicas Raúl Carrea, FLENI, Montañeses 2325, 1428 Ciudad Autónoma de Buenos Aires (Buenos Aires), Argentina;1. Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea;2. Department of Biology Education, Chonbuk National University, Jeonju-City, 54896, Republic of Korea;1. Department of Life Sciences, Ecology Section, University of Alcalá, Madrid, Spain;2. Department of Evolutionary Ecology, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain;1. MTA-ÖK BLI NAP_B Adaptive Neuroethology, MTA-Centre for Ecological Research, Balaton Limnological Institute, 8237 Tihany, Hungary;2. Department of Hydrozoology, MTA-Centre for Ecological Research, Balaton Limnological Institute, 8237 Tihany, Hungary;3. Chemical Ecology and Neurobiology, Department of Experimental Zoology, MTA-Centre for Ecological Research, Balaton Limnological Institute, 8237 Tihany, Hungary
Abstract:Sphenodon, a lizard-like reptile, is the only living representative of a group that was once widespread at the time of the dinosaurs. Unique jaw mechanics incorporate crushing and shearing motions to breakdown food, but during this process excessive loading could cause damage to the jaw joints and teeth. In mammals like ourselves, feedback from mechanoreceptors within the periodontal ligament surrounding the teeth is thought to modulate muscle activity and thereby minimise such damage. However, Sphenodon and many other tetrapods lack the periodontal ligament and must rely on alternative control mechanisms during biting. Here we assess whether mechanoreceptors in the jaw joints could provide feedback to control muscle activity levels during biting. We investigate the relationship between joint, bite, and muscle forces using a multibody computer model of the skull and neck of Sphenodon. When feedback from the jaw joints is included in the model, predictions agree well with experimental studies, where the activity of the balancing side muscles reduces to maintain equal and minimal joint forces. When necessary, higher, but asymmetric, joint forces associated with higher bite forces were achievable, but these are likely to occur infrequently during normal food processing. Under maximum bite forces associated with symmetric maximal muscle activation, peak balancing side joint forces were more than double those of the working side. These findings are consistent with the hypothesis that feedback similar to that used in the simulation is present in Sphenodon.
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