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Atlas coordinate system and stereotaxic reference system. Montage of CT image of mid-parasagittal skull with the abrupt decline of occipital crest and the side-view image of the brain in standard orientation of the atlas. The red dotted line corresponds to the outer skull profile of the parasagittal CT image 1000 µm lateral to midline. The horizontal tangential plane through the most dorsal points of cerebrum and cerebellum and the brain stem axis is indicated by black dashed lines
