Table S2.

Landmarks and curves used in this study

Landmarks/curves	Definition
Landmarks
Basion	Midpoint of the anterior margin of the foramen magnum
Opisthion	Midpoint of the posterior margin of the foramen magnum
Middle spheno-occipital	Spheno-occipital suture at the midline
Dorsum sellae	Anterior edge at the midline
Sphenoidale	Most posterior, superior midline point of planum sphenoideum
Posterior “olfactory pit”	Posterior edge of the olfactory pit at the midline
Anterior olfactory pit	Anterior edge of the olfactory pit at the midline
Internal occipital protuberance	Superior edge of transverse sinus at the midline
Left/right lateral foramen magnum	Widest point, immediately above left/right hypoglossal canal
Left/right superior orbital fissure	Lateral vertex
Left/right foramen ovale	Most posterior and lateral point
Left/right foramen rotundum	Lateral vertex
Left/right jugular foramen	Most anterior and inner point
Left/right spheno-occipital	Lateral spheno-occipital suture
Left/right spheno-parietal	At the junction
Left/right petrous-occipital	Maximum curvature point at the junction
Left/right petrous	Petrous apex
Curves
Midline occipital	Along the midline from foramen magnum to spheno-occipital suture
Middle sphenoid	Along the midline in anterior cranial fossa
Left/right lateral occipital	From jugular foramen to spheno-occipital suture. Delimiting brainstem
Left/right sphenoid	From superior orbital fissure to spheno-parietal junction. Delimiting anterior and middle cranial fossa
Left/right petrous	Delimiting posterior and middle cranial fossa
Transverse sinus	Delimiting vault from posterior cranial fossa
Left/right anterior cranial fossa	From olfactory pit to spheno-parietal junction. Delimiting frontal lobe/anterior cranial fossa ventral and dorsal regions
Midsagittal	From anterior olfactory pit to internal occipital protuberance
Basioccipital	From internal occipital protuberance to opisthion, at the midline