Figure 2. Intraoperative method used for localization of the middle meningeal artery (MMA): measurements to establish the zygomatic-meatal angle on (A) a human skull and (B) at the time of surgery. (C) Intraoperative fluoroscopic confirmation of the site of calvarial entry of the MMA. One should avoid a perfect lateral exposure by tilting the C-arm exposure, which separates the orbital roofs (arrows 1 and 2) as well as the contra-lateral (arrow 3) and ipsilateral grooves (arrow 4) for the MMA.