Porion

Japanese: Porion

…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. …

From [Anthropometry]

… The principles of skull and skeletal measurements are the same as those for biomedical measurements, but the sutures and irregularities in the skeleton are clear, so the measurement points can be defined accurately (Figure). The center point of the upper edge of the external auditory canal is called the porion, and is used as the reference point for the auricular-ocular plane. The midpoint of the anterior edge of the foramen magnum is called the budgeon, and the intersection of the sagittal suture and coronal suture is called the bregma. The distance between the two is called the budgeon-bregma height, and represents the height dimensions of the skull. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。…

【人体測定法】より

…　頭蓋および骨格計測の原理は生体計測の場合と同一であるが，骨格では縫合，凹凸が明瞭なために計測点は正確に定義できる（図）。外耳孔上縁の中央点をポリオンPorionといい，耳眼平面の基準点とする。また大後頭孔の前縁の正中点バジオンBasion，矢状縫合と冠状縫合との交点をブレグマBregmaとよび，両者の距離をバジオンブレグマ高といい，頭蓋の諸高径を代表する。…

※「Porion」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

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