Hanihara T, Ishida H, Dodo Y
Department of Anatomy, Tohoku University School of Medicine, Japan.
J Anat. 1998 May;192 ( Pt 4)(Pt 4):539-55. doi: 10.1046/j.1469-7580.1998.19240539.x.
The frequency of the Os zygomaticum bipartitum was examined in major human populations around the world. Eastern Asians have a higher frequency of the bipartite zygomatic bone than any other geographical groups. The arctic peoples, Amerindians and the Oceanians, who all may have derived from eastern Asian population stocks, have a considerably low frequency of this trait. The frequency distribution from East/Southeast Asia to Africa and Europe through South/Central/West Asia suggests some clinality for the bipartite zygomatic bone. The second peak in the frequency is seen in Subsaharan Africa. The clinal variation with no identifiable regulation by subsistence patterns and environmental factors suggested a genetic background for the occurrence of the Os zygomaticum bipartitum.
在世界各地的主要人群中对二分颧骨的出现频率进行了研究。东亚人二分颧骨的出现频率高于其他任何地理群体。北极人群、美洲印第安人和大洋洲人，他们都可能源自东亚人口群体，这一特征的出现频率相当低。从东亚/东南亚经南亚/中亚/西亚到非洲和欧洲的频率分布表明二分颧骨存在一定的渐变群。频率的第二个峰值出现在撒哈拉以南非洲。这种渐变变异不受生存模式和环境因素的明显调控，这表明二分颧骨的出现具有遗传背景。
