Orbitale

…When the human head and face are viewed from the side, this is the angle that indicates the inclination of the facial contour. The angle is calculated by the intersection of the contour with the auricular plane (the plane determined by the upper edge of the external auditory canal on both sides, Porion, and in living organisms, the upper edge of the ear cartilage, Tragion, and the lowest point of the left orbital entrance, Orbitale). The angle that the straight line connecting the boundary point between the frontal bone and the nasal bone, Nasion, and the most anterior point of the upper alveolus, Prosthion, makes with the auricular plane is called the total lateral angle. …

*Some of the terminology that mentions "Orbitale" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ヒトの頭顔部を側面からみて，顔面の輪郭の傾きを示す角度である。輪郭が耳眼平面(左右の外耳孔上縁点Porion，生体では耳軟骨の上縁Tragionと左側の眼窩入口の最低点Orbitaleによって決定される面)と交差してなす角を求める。この時に前頭骨と鼻骨の境界点Nasionと上側歯槽の最前点Prosthionとを結ぶ直線が耳眼平面となす角を全側面角という。…

※「Orbitale」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。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報