Anterior cranial fossa
Middle cranial fossa
Posterior cranial fossa
100

Anterior and lateral border

Frontal bone and ethmoid (cribriform plate)

100

anterior and lateral border

lesser wings of the sphenoid

100

anteromedial border

dorsum sellae of the sphenoid

200

posterior and medially

body of the sphenoid

200

anterior and medial

body of the sphenoid

200

anterolateral

superior border of the petrous part of the temporal bone

300

Posterior and lateral border

lesser wing of sphenoid

300

posterior and lateral

superior border of the petrous part of the temporal bone

300

posterior 

occipital bone (squamous part)

400

The floor is formed by 3 structures

frontal bone

ethmoidal bone

lesser wing (anterior aspect)

400

posterior and medial

dorsum sellae of the sphenoid

400

floor

mastoid part of the temporal bone and the occipital bone (squamous, basilar and condylar)

500

floor of fossa

body and greater wing of sphenoid, squamous and petrous parts of the temporal bone

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