Lateral part of middle cranial fossa and posterior
cranial fossa are divided by:
Petrous temporal bone
Crista galli
Transverse groove
Sphenoid bone
The interior of base of skull is naturally divided into 3 fossae
	
Anterior cranial fossa
Middle cranial fossa
Posterior cranial fossa


Lesser wing of sphenoid with anterior clinoid process divides anterior and middle cranial fossa.
Petrous temporal bone separates the lateral part of middle cranial fossa from posterior cranial fossa.
Dorsum sellae of sphenoid bone with posterior clinoid process separates the median part of middle cranial fossa from posterior cranial fossa.