Fig. 3
An example of the MRA study. The plastic template with the eight identical sectors and the three nutritive arterial branches of the external carotid artery (white lines) are shown: superficial temporal (a), posterior auricular (b), and occipital (c) arteries. The EAC of the right ear is marked with “#” and the helix with “*”. The arrows show the direction of blood flow. The thick black line is a 6 cm long section between the external auditory meatus and the anticipated place of the screw and is the border of sectors A and B