Distinct growth of the nasomaxillary complex in Au. sediba.
Distinct growth of the nasomaxillary complex in Au. sediba.
复制标题
金中鼻上颌复合体的明显生长。
DOI：
10.1038/srep15175
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发表时间：
2015
影响因子：
4.6
通讯作者：
Berger,LeeR
中科院分区：
文献类型：
--
作者：
Lacruz,RodrigoS;Bromage,TimothyG;O'Higgins,Paul;Toro-Ibacache,Viviana;Warshaw,Johanna;Berger,LeeR
对未成熟古人类面部个体发育的研究对理解人类生长发育的进化具有重要意义。最近发现的古人类物种南方古猿sedibais以一具保存完好且几乎完整的幼年面部骨骼（MH1）为代表，显示出衍生的面部解剖结构。我们使用高辐射同步加速器检测MH1，以解释与面部生长相关的口鼻复合体的特征。我们还分析了骨表面显微解剖，以识别和绘制影响面部骨骼发育的骨沉积和骨吸收场。口鼻解剖结构（前颌-腭-下颌结构）与其他南方古猿物种相似。然而，中脸（鼻颌复核）的表面生长重塑与南方古猿、傍人猿、KNM-WT 15000的早期猿人（直立人/埃格斯特人）明显不同，显示出与前牙根和鼻下区域相关的垂直排列的交替沉积和吸收场的明显分布。MH1中脸的个体发育表面上类似于h。智人素重塑场的分布。MH1的面部生长在早期古人类中是独特的，代表了1.9岁时面部个体发育的进化修改，或者与饮食相关的咀嚼系统负荷的变化。
Studies of facial ontogeny in immature hominins have contributed significantly to understanding the evolution of human growth and development. The recently discovered hominin speciesAutralopithecus sedibais represented by a well-preserved and nearly complete facial skeleton of a juvenile (MH1) which shows a derived facial anatomy. We examined MH1 using high radiation synchrotron to interpret features of the oronasal complex pertinent to facial growth. We also analyzed bone surface microanatomy to identify and map fields of bone deposition and bone resorption, which affect the development of the facial skeleton. The oronasal anatomy (premaxilla-palate-vomer architecture) is similar to otherAustralopithecusspecies. However surface growth remodeling of the midface (nasomaxillary complex) differs markedly fromAustralopithecus,Paranthropus, earlyHomoand from KNM-WT 15000 (H. erectus/ergaster) showing a distinct distribution of vertically disposed alternating depository and resorptive fields in relation to anterior dental roots and the subnasal region. The ontogeny of the MH1 midface superficially resembles someH. sapiensin the distribution of remodeling fields. The facial growth of MH1 appears unique among early hominins representing an evolutionary modification in facial ontogeny at 1.9 my, or to changes in masticatory system loading associated with diet.