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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Post-orbital constriction ： ウィキペディア英語版 Post-orbital constriction In physical anthropology, post-orbital constriction is a narrowing of the cranium (skull) just behind the eye sockets (the orbits, hence the name), in primates — including primitive hominids. This constriction is very noticeable in non-human primates, slightly less so in Australopithecines, even less in Homo erectus and the most primitive Homo sapiens. It completely disappears in modern Homo sapiens. Thus, it is a useful, quantifiable measure of how far along the evolutionary path a hominid fossil might be placed. Post-orbital constriction is defined by an index of minimum frontal breadth (MFB) behind the supraorbital torus divided by maximum upper facial breadth (bifrontomalare temporale, BFM). For extant hominids the index value ranges from 0.46 to 0.8, with a mean index value of 0.66. 〔 ==See also== * Alveolar prognathism 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Post-orbital constriction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.