Internal base of the cranium
| Term name | Layer | |
|---|---|---|
| 1 | Petro-occipital fissure | Layer 1 |
| 2 | Petrosphenoidal fissure; sphenopetrosal fissure | Layer 1 |
| 3 | Foramen lacerum | Layer 1 |
| 4 | Clivus | Layer 1 |
| 5 | Arterial grooves | Layer 1 |
| 6 | Impressions of cerebral gyri | Layer 1 |
| 7 | Posterior cranial fossa | Layer 1 |
| 8 | Middle cranial fossa | Layer 1 |
| 9 | Anterior cranial fossa | Layer 1 |