Fig. 2. The location of the pterion as linear distances from specific landmarks. CP, center of the pterion; CPS, distance from the center of the pterion to the posterolateral margin of the frontozygomatic suture; CPZ, distance from the center of the pterion to the midpoint of the zygoma; F, frontal bone; FZ, the frontal process of the zygomatic bone with the fronto-zygomatic suture intervening; S, posterolateral margin of the frontozygomatic suture; Z, midpoint of the zygoma.