The ligamental scar in the costovertebral articulation of the tyrannosaurid dinosaurs
The ligamental scar in the costovertebral articulation of the tyrannosaurid dinosaurs
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DOI：
10.4202/app.2009.0106
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发表时间：
2009-03-01
影响因子：
1.8
通讯作者：
Hirasawa, Tatsuya
中科院分区：
文献类型：
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作者：
Hirasawa, Tatsuya
在肋骨抽吸方面，肋椎关节对于约束胸部运动学和推断呼吸机制是不可或缺的。然而，非鸟类兽脚亚目动物肋椎关节的结构此前还没有得到很详细的研究。这项研究突出了暴龙科，这是由许多完整的标本代表的。对10个霸王龙标本的肋骨关节进行了研究，其中包括两个近原位关节化石，并与现存的始祖龙标本进行了比较。对于现存的始龙，进行了解剖以使霸王龙的软组织解剖合理化。这项研究表明，肋骨与霸王龙胸腔中相应的脊椎横突的远端连接在腹侧或后腹侧。重建肋骨横韧带，将肋骨结节与每个关节的横突连接起来。利格的伤疤。在许多兽脚类骨骼中可以辨认出肋骨横断面，这种粗糙度可以用来识别肋骨的旋转轴。这一结果为探索导致鸟类的兽足类谱系中胸腔和呼吸机制的进化提供了基石。
The costovertebral articulation is integral to constrain the thoracic kinematics and to infer the breathing mechanism in the respect with costal aspiration. However, the structure of the costovertebral articulation in non-avian theropods has not been studied in great detail before. This study highlights the Tyrannosauridae, which is represented by numerous complete specimens. Costovertebral articulations of ten tyrannosaurid specimens, including two nearly in-situ articulated fossils, were investigated and compared with those in extant Archosauria. For extant archosaurs, dissections were conducted to rationalize the Soft tissue anatomy in tyrannosaurids. This study shows that the rib articulates ventrally or posteroventrally with the distal end of the corresponding vertebral transverse process in the tyrannosaurid ribcage. A ligament (liganientum costotransversarium) call be reconstructed to connect the rib tuberculum to the transverse process in each articulation. The scar for lig. costotransversarium is recognizable in many theropod skeletons, and this rugosity can be used to identify the rotational axis for the rib. This result provides a cornerstone for exploring the evolution of the ribcage and breathing mechanisms across the theropod lineage leading to birds.