Fig. 3. Type 1 angulation. Note the gentle curve the cavernous ICA takes; specially the first bend of C-ICA (i.e., A3). The black bands demarcate different parts of ICA. ICA, internal carotid artery; P-ICA, petrous part of ICA; C-ICA; cavernous part of ICA; A1, first angle of petrous segment; A2, second angle of petrous segment; A3, first angle of cavernous segment; A4, second angle of cavernous segment.
