(1)a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges
(2)眉の間と上の前頭骨の滑らかな突起
(3)眼窩上隆起の高さにある中間線の額の最も前面にある突起の先端