Cranial fossa

Boundaries 1: Sphenoidal limbus (anterior margin of the chiasmatic groove) 2: Posterior borders of the lesser wings of the sphenoid 3: Dorsum sellae of the sphenoid bone 4: Superior borders of the petrous part of the temporal bone A cranial fossa is formed by the floor of the cranial cavity.

There are three distinct cranial fossae:[1]