In the occipital bone
, the lower division of the cruciate eminence
is prominent, and is named the internal occipital crest
; it bifurcates near the foramen magnum
and gives attachment to the falx cerebelli
; in the attached margin of this falx is the occipital sinus
, which is sometimes duplicated.
In the upper part of the internal occipital crest, a small depression is sometimes distinguishable; it is termed the vermian fossa since it is occupied by part of the vermis of the cerebellum.