azhdarchid翼龙颈椎螺旋状交叉支柱及其生物力学意义。

PubMed ID
发表日期 2021年Apr月

原始出处 iScience公司
iScience
作者 Williams  Cariad J  Pani  Martino  Bucchi  Andrea  Smith  Roy E  Kao  Alexander  Keeble  William  Ibrahim  Nizar  Martill  David M 

文献标题 azhdarchid翼龙颈椎螺旋状交叉支柱及其生物力学意义。
Helically arranged cross struts in azhdarchid pterosaur cervical vertebrae and their biomechanical implications.

文献摘要

阿兹达奇翼龙是最大的飞行脊椎动物,但人们对其古生物学的基本方面仍知之甚少。X射线计算机断层扫描揭示了白垩纪阿兹达奇翼龙(Alanqa sp.)三维保存的超细长颈椎复杂的内部微结构。椎体内神经管的合并和椎体的伸长导致“管中管”由螺旋状分布的小梁支撑。线弹性静态分析和线性化屈曲分析以及有限元模型表明,只有50个小梁可使屈曲荷载增加90%,这意味着没有小梁的脊椎更容易因轴向荷载而发生弹性失稳。将神经管纳入椎体管可为颈椎序列增加相当大的刚度,允许摄取重猎物而不会对颈椎序列造成损害,同时允许大量骨量减少。


Azhdarchid pterosaurs, the largest flying vertebrates, remain poorly understood, with fundamental aspects of their palaeobiology unknown. X-ray computed tomography reveals a complex internal micro-architecture for three-dimensionally preserved, hyper-elongate cervical vertebrae of the Cretaceous azhdarchid pterosaur, Alanqa sp. Incorporation of the neural canal within the body of the vertebra and elongation of the centrum result in a "tube within a tube" supported by helically distributed trabeculae. Linear elastic static analysis and linearized buckling analysis, accompanied with a finite element model, reveal that as few as 50 trabeculae increase the buckling load by up to 90%, implying that a vertebra without the trabeculae is more prone to elastic instability due to axial loads. Subsuming the neural tube into the centrum tube adds considerable stiffness to the cervical series, permitting the uptake of heavy prey items without risking damage to the cervical series, while at the same time allowing considerable skeletal mass reduction.


获取全文 10.1016/j.isci.2021.102338