Gnathion

…Facial height divided by facial width, a numerical value that indicates the width of the face. In the skull, the facial height (from the boundary point between the frontal bone and the nasal bone, Nasion, to the median lower edge of the mandible, Gnathion) divided by the buccal arch width (the width connecting the points where the left and right buccal arches protrude laterally) is called the facial index. The height from the Nasion to the most anterior point of the upper alveolus, Prosthion, is called the upper facial height, and is used to calculate the upper facial index. …

*Some of the terminology explanations that mention "Gnathion" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…顔面高を顔面幅で割った値で，顔面の広狭を表す数値。頭蓋骨では顔面高(前頭骨と鼻骨の境界点Nasionから下顎骨の正中下縁Gnathionまで)を頰骨弓幅(左右の頰骨弓が側方に突出した点を結ぶ幅径)で割った値を顔示数という。またNasionから上側歯槽の最前点Prosthionまでの高さを上顔高といい，これを用いて上顔示数を算出する。…

※「Gnathion」について言及している用語解説の一部を掲載しています。

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