Fig. 5: Coordinates of PM borders in MNI space.

A The rostral (white line) and caudal (light blue line) borders of the PM are quantified by y levels (dashed lines) based on the MPMs in MNI Colin27 space. The rostral border on its dorsal end (rostro-dorsal border, on the SFS) is located on the SFG at y = 15 mm, the rostro-ventral border is marked by the inferior preCS and was located at y = 9. In between, on the MFG, the border retreated a few mm more caudally. The caudo-dorsal border is located on the preCG at y = −23 and the caudo-ventral border, marked by the CS, at y = 0. In between, the border ran in a slightly rostrally orientated curve. B The border between the PMd and PMv is topographically marked by the SFS and located on its ventral bank as shown in coronal section (position at y = -6, marked by arrows on the brain surface) on the right-hand side. The course of the SFS goes towards ventral and its fundus is located ventrally to the entrance on the surface. Taking into account this special topography of the SFS, it is necessary to define z levels for a dorsal border marked by the entrance of the SFS on the surface as well as a ventral border in the depth on the level of the fundus of the SFS. Dorsally, on the brain surface, the border is marked by the entrance of the SFS (white line). At the rostral part the border is located at z = 63 and at the caudal part at z = 69. Ventrally, in the depth, the border is marked by the fundus of the SFS (white dashed line), rostrally located at z = 42 and caudally at z = 50.