Bone geometry in cercopithecoid mandibles
Bone geometry in cercopithecoid mandibles
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DOI：
10.1016/s0003-9969(01)00115-7
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发表时间：
2002-04-01
影响因子：
3
通讯作者：
Daegling, DJ
中科院分区：
文献类型：
--
作者：
Daegling, DJ
本研究探讨了颈猿类灵长类动物下颌骨皮质骨几何形状与体内咀嚼应激模式和饮食专门化之间的关系。采用计算机断层扫描技术对三种旧大陆猴（麻头猴、坏原猴、白斑猴）下颌骨皮质骨分布进行了研究。切片内骨的排列被量化为(1)皮质面积与封闭（总）骨膜下面积之比；(2)面积正交秒矩比；(3)皮质面积和区域厚度的尺寸调整测量。不同样品的截面几何形状不同。但在个别切片中发现了一致的皮质变薄和骨面积的模式。尽管这三个分类群在饮食和摄食行为上存在显著差异，但这种一致性仍然存在。在这3只猴子中发现舌骨薄，基部骨厚的皮质骨；先前发表的数据表明，这种模式可能在类人猿灵长类动物中是典型的。据推测，剪切、弯曲和扭转的相互作用会在体切片中产生偏心载荷，这反映在皮质骨的不对称排列上。当与其他灵长类动物群体的现有数据进行解释时。这些结果与假设一致，即尽管在亚目中发现了独特的咬合，但类人猿的咀嚼负荷概况大致相似。因此，对饮食对颌骨形态影响的理解是。考虑皮质骨分布不能改善。也就是说，从颚形推断饮食最好是基于相对唇大小的考虑，而不是截面几何形状。(C) 2002 Elsevier Science Ltd.版权所有。
This study explores the relation between cortical bone geometry in the mandibular corpus and in vivo masticatory stress patterns and dietary specialization in cercopithecoid primates. Cortical bone distribution in the mandibles of three species of Old World monkeys (Macaca fascicularis, Procolobus badius, Lophocebus albigena) was measured by computed tomography. The arrangement of bone within sections was quantified as (1) the ratio of cortical area to the enclosed (total) subperiosteal area; (2) the ratio of orthogonal second moments of area; and (3) size-adjusted measures of cortical area and regional thickness. Cross-sectional geometry differed among samples. but consistent patterns of cortical thinning and bone area were found within individual sections. This consistency was despite the marked differences in diet and feeding behavior that distinguish the three taxa. Lingually thin and basally thick cortical bone was found in the three monkeys; previously published data suggest that this pattern may be stereotypical among anthropoid primates. It is hypothesized that the interactive effects of shear, bending and torsion produce eccentric loads in corpus sections, which are mirrored by this asymmetrical arrangement of cortical bone. When interpreted against existing data for other primate groups. these results are consistent with the hypothesis that masticatory-loading profiles are broadly similar across anthropoids despite the distinctive occlusions found among the suborder. Understanding of the impact of diet on jaw morphology is, therefore. not improved by considerations of cortical bone distribution. i.e. the inference of diet from jaw form is best predicated on considerations of relative cot-pus size rather than cross-sectional geometry. (C) 2002 Elsevier Science Ltd. All rights reserved.