falx cerebelli

It is situated in the attached margin of the falx cerebelli, and is generally single, but occasionally there are two.

Falx cerebelli, vertical infolding; lies inferior to the tentorium cerebelli, separating the cerebellar hemispheres.

The cerebellar falx (or falx cerebelli) is a vertical dural infolding that lies inferior to the cerebellar tentorium in the posterior part of the posterior cranial fossa.