Musculoskeletal modelling of the dragonfly mandible system as an aid to understanding the role of single muscles in an evolutionary context
Musculoskeletal modelling of the dragonfly mandible system as an aid to understanding the role of single muscles in an evolutionary context
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DOI：
10.1242/jeb.132399
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发表时间：
2016-04-01
影响因子：
2.8
通讯作者：
Blanke, Alexander
中科院分区：
文献类型：
--
作者：
David, Sina;Funken, Johannes;Blanke, Alexander
昆虫的口器和肌肉结构多种多样；然而，他们的口器运动学和肌肉激活模式的知识是零碎的。了解肌肉群在运动中的作用，并在昆虫群之间进行比较，可以深入了解进化模式和功能限制。在此，我们基于微计算机断层扫描（mu CT）数据和咬合力测量建立了一个包含不同肌肉的昆虫头-下颌骨-肌肉复合体的数学逆动力学模型。随着mu CT的出现，现在有可能获得昆虫肌肉附着区域和头囊结构的精确空间信息。我们的模型显示了特定纤维群的独特激活模式，可能与几何相关的优化有关。肌肉激活模式表明下颌内肌肉在咬合力产生中起次要作用，这是在一些高等昆虫谱系中下颌内肌肉缺失的潜在原因。我们的模型与之前研究快肌纤维和慢肌纤维的研究一致，并且能够解决昆虫中这些不同肌肉类型的时空激活模式。本文所使用的模型具有很高的潜力，可以用于对不同肌肉结构和头囊设计在大型昆虫中所起作用的大规模比较分析，以帮助我们理解机械约束下昆虫头囊和口器的进化。
Insects show a great variety of mouthpart and muscle configurations; however, knowledge of their mouthpart kinematics and muscle activation patterns is fragmentary. Understanding the role of muscle groups during movement and comparing them between insect groups could yield insights into evolutionary patterns and functional constraints. Here, we developed a mathematical inverse dynamic model including distinct muscles for an insect head-mandible-muscle complex based on micro-computed tomography (mu CT) data and bite force measurements. With the advent of mu CT, it is now possible to obtain precise spatial information about muscle attachment areas and head capsule construction in insects. Our model shows a distinct activation pattern for certain fibre groups potentially related to a geometry-dependent optimization. Muscle activation patterns suggest that intramandibular muscles play a minor role in bite force generation, which is a potential reason for their loss in several lineages of higher insects. Our model is in agreement with previous studies investigating fast and slow muscle fibres and is able to resolve the spatio-temporal activation patterns of these different muscle types in insects. The model used here has a high potential for large-scale comparative analyses on the role of different muscle setups and head capsule designs in the megadiverse insects in order to aid our understanding of insect head capsule and mouthpart evolution under mechanical constraints.