However, SS showed consistent value of 1.5 below SF.

Average value for CP was 0.01 below eSF, giving a significantly closer value compared to the one of SS (p<0.01).

50% patients had Chater's point (CP) above eSF. The eSF was identified at 0 cm anteriorly from OM, and perpendicularly 1.5 cm above SS. Inferior Rolandic point, which corresponds to the central sulcus inferior extent, was found to be at 2 cm from OM line. Anterior sylvian point, the most anterior part of SF, was found at 4 cm from OM line. At a distance of 0 to 1.5 cm, SSs were located above SF, then started to merge and went side by side from 2 cm anteriorly. The distance of SF was compared with the one of SS. The measurement points were determined from external auditory meatus 0, 1, 1.5, 2, 2.5, 3, 3.5 and 4-cm anteriorly, perpendicular from orbitomeatal (OM) line. Unfortunately little have been addressed concerning its relationship with external cranial surface.Ĭorrelation between Squamous Suture (SS) and SF was investigated.ĥ0-adult 3D-CTA images were studied using OSIRIX DICOM viewer. Sylvian fissure (SF) is an important corridor in neurosurgery, and the end of sylvian fissure (eSF) represents the optimal target area to expose suitable recipient artery in STA-MCA bypass.

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