The<unk> system is defined by making two anchors, the anterior commissure and posterior commissure, lie on a straight horizontal line. Since these two points lie on the midsagittal plane, the<unk> system is completely defined by requiring this plane to be vertical. Distances in<unk>  are measured from the anterior commissure as the origin (as defined in the 1998 edition). The y-axis points posterior and anterior to the commissures, the left and right is the x-axis, and the z-axis is in the ventral-dorsal (down and up) directions. Once the brain is reoriented to these axes, the researchers must also outline the six cortical outlines of the brain: anterior, posterior, left, right, inferior, and superior. In the 1967 atlas the left is with positive<unk>  while in the 1988 atlas the left has negative<unk> . By defining standard anatomical landmarks that could be identified on different subjects (the anterior and posterior commissures), it became easier to spatially warp an individual brain image obtained through Magnetic Resonance Imaging (MRI), positron emission tomography (PET) and other imaging methods to this standard<unk>  space. One can then make inferences about tissue identity at a specific location by referring to the atlas.
Talairach coordinates
Anatomical terms of motion
Milch classification
Krogh length
Breslow's depth
Afterimage
Stimson line
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