Aerts Peter
Department Biology, Functional Morphology, University of Antwerp (UIA), B-2610 Wilrijk (Antwerpen), Belgium.
J Morphol. 1991 Jun;208(3):323-345. doi: 10.1002/jmor.1052080308.
In fishes, the abducting hyoid bars push the suspensoria outwards. This force transmission is generally assumed to be important during fast suction feeding (strenuous activity). In Astatotilapia elegans the hyoid symphysis can best be modelled as an oblique hinge. The relevance of this hinge morphology on the force transmission has been studied by means of a three-dimensional (3D) model simulating the displacements of the hyoid-suspensorial system. It appears that the transmission force factor increases throughout feeding in the case of the hinge model. Reduction of the hyoid symphysis to a point articulation (as was done formerly in attempts to quantify the transmission by means of planar models) suggests an unfavourable decline of the transmission force to zero during maximal mouth expansion. The angle between the hinge axis of the symphysis and the longitudinal axis of the hyoid bar is 45°. Such a configuration allows for a maximal increase in the volume of the buccal cavity for suction. This functional aspect, together with the apparent maximization of the force transmission during feeding, suggests that constructional and neuromotoric factors have been improved during the evolutionary development of the hyoid-suspensorial system.
在鱼类中，外展的舌骨弓将悬器向外推。这种力的传递通常被认为在快速吸食进食（剧烈活动）过程中很重要。在秀丽阿氏丽鱼中，舌骨联合最好被模拟为一个斜铰链。通过一个模拟舌骨 - 悬器系统位移的三维（3D）模型，研究了这种铰链形态对力传递的相关性。结果表明，在铰链模型的情况下，传递力因子在整个进食过程中都会增加。将舌骨联合简化为一个点关节（如以前在试图通过平面模型量化传递时所做的那样）表明，在最大口腔扩张时，传递力会不利地下降到零。联合的铰链轴与舌骨弓的纵轴之间的角度为45°。这样的配置允许口腔用于吸食的体积最大程度增加。这一功能方面，连同进食过程中力传递的明显最大化，表明在舌骨 - 悬器系统的进化发展过程中，结构和神经运动因素得到了改善。
