Trabecular Architecture of the Manual Elements Reflects Locomotor Patterns in Primates
Trabecular Architecture of the Manual Elements Reflects Locomotor Patterns in Primates
复制标题
手动元素的小梁结构反映了灵长类动物的运动模式
作者：
Stacey A. Matarazzo
在灵长类动物的长骨和掌骨头中，骨小梁的形态学已被证明对载荷模式敏感。我们还可以看到，在灵长类动物的手指上，有着不同的运动方式。灵长类动物的近端和中间趾骨是承重元件，在悬挂、四足行走和指关节行走期间，它们以不同的姿势保持并且经历不同的机械应变。利用微型CT扫描中节指骨、近节指骨和第三排掌骨头，研究了黑猩猩、大猩猩、庞戈、长臂猿和猕猴骨小梁的取向模式。几个区域，即，近端的指骨和掌骨头，能够区分关节行走，四足，和悬挂灵长类动物。方向和形状似乎是主要的区别因素，但在骨体积，各向同性指数和各向异性程度的差异被视为跨纳入分类群。悬灵长类动物主要表现为proximodistal对齐在所有区域，四足动物更多的掌背方向在几个区域。指关节步行者的特点是在指骨的近端具有近远侧对齐，在远端和掌骨头具有掌背对齐。这些结构上的差异可能被用来推断已灭绝灵长类动物类群的locmotor倾向。
The morphology of trabecular bone has proven sensitive to loading patterns in the long bones and metacarpal heads of primates. It is expected that we should also see differences in the manual digits of primates that practice different methods of locomotion. Primate proximal and middle phalanges are load-bearing elements that are held in different postures and experience different mechanical strains during suspension, quadrupedalism, and knuckle walking. Micro CT scans of the middle phalanx, proximal phalanx and the metacarpal head of the third ray were used to examine the pattern of trabecular orientation in Pan, Gorilla, Pongo, Hylobates and Macaca. Several zones, i.e., the proximal ends of both phalanges and the metacarpal heads, were capable of distinguishing between knuckle-walking, quadrupedal, and suspensory primates. Orientation and shape seem to be the primary distinguishing factors but differences in bone volume, isotropy index, and degree of anisotropy were seen across included taxa. Suspensory primates show primarily proximodistal alignment in all zones, and quadrupeds more palmar-dorsal orientation in several zones. Knuckle walkers are characterized by having proximodistal alignment in the proximal ends of the phalanges and a palmar-dorsal alignment in the distal ends and metacarpal heads. These structural differences may be used to infer locmotor propensities of extinct primate taxa.
影响因子：
2.4
作者：
Mittra, E;Rubin, C;Qin, YX
通讯作者：
Qin, YX