skocc01
v foramen magnum
a opisthision
b petrous pyramid  (also seeskct06, sklat11)
c internal auditory meatus  (also seeskct08)
d dorsum sellae  (also seesklat06skct05)
e base, greater wing of sphenoid
f inferior orbital fissure
g postero-lateral wall, maxillary antrum
h maxillary antrum
i neck of mandible