在光 astragalar 形态差异的视野中,对artiodactyls 和perissodactyls 的关节移动性的功能形态比较研究
Sei-Ichiro Takeda1,2, Yoichi Masuda1, Truong Son Nguyen3,4
1Department of Mechanical Engineering, The University of Osaka, Osaka, Japan.
Journal of anatomy
|January 20, 2026
概括
类动物的双轮星通过明显的旋转分区增强了关节的移动性,而不是仅仅延长了脚杆臂. 这种解剖学适应在很大程度上塑造了形的形态和功能.
科学领域:
- 比较解剖学的比较解剖学.
- 生物力学 生物力学
- 古生物学的古生物学
背景情况:
- 大多数哺乳动物都有一个单式的形,用于骨的关节.
- 类动物拥有双轮的天,假设通过延长脚杆臂来增加脚下屈曲力.
- 之前的假设缺乏实证的ex vivo验证.
研究的目的:
- 实证地测试关于双螺旋阿斯特拉加勒斯对杆臂长度的影响的假设.
- 为了研究形体形态和关节运动之间的关系,在artiodactyls和其他哺乳动物.
- 量化骨的运动范围 (ROM) 和关节分区.
主要方法:
- 15种哺乳动物的后肢CT扫描.
- 关节的3D重建的生成.
- 量化不同姿势中的距离,骨间角和ROM.
主要成果:
- 脊椎动物表现出在星体内旋转的功能位置的转移,保持相对恒定的有效杆长度.
- 不同于单轮的物种,在这些物种中,calcaneus和astragalus在很大程度上是不移动的,artiodactyls显示出显著的calcaneo-astragalar移动性 (高达90°).
- 关节的移动性分布在近端和远端的关节之间,反动物和驼类动物表现出相当大的移动性,特别是在远端关节.
结论:
- 双滑轮与独特的关节分区和骨内移动性有关,而不仅仅是杆臂延伸.
- 这项研究突出了双天在塑造形形形态的解剖学意义.
- 类似的关节配置的融合进化被建议在驼类动物和反动物中.
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