| 1
.
| Orbital part of frontal bone |
| 2
.
| Cribriform plate ethmoid bone |
| 3
.
| Sulcus of left middle meningeal artery |
| 4
.
| Anterior horn lateral ventricle left |
| 5
.
| Interventricular foramen |
| 6
.
| Sulcus of middle meningeal artery (anterior branch) |
| 7
.
| Sulcus middle meningeal artery (posterior branch) |
| 8
.
| Area of opacity due to soft tissue, possibly the massa intermedia |
| 9
.
| Third ventricle |
| 10
.
| Central part of left lateral ventricle |
| 11
.
| Area of overlapping air shadows of the right and left lateral ventricles |
| 12
.
| Atrium of the lateral ventricle |
| 13
.
| Posterior horn lateral ventricle left |
| 14
.
| Posterior horn lateral ventricle right |
| 15
.
| Trephine openings |
| 16
.
| Lateral margin of orbit |
| 17
.
| Hard palate |
| 18
.
| Anterior wall of middle cranial fossa right |
| 19
.
| Anterior wall of middle cranial fossa left |
| 20
.
| Anterior clinoid process sphenoid bone |
| 21
.
| Optic recess third ventricle (supraoptic recess) |
| 22
.
| Posterior clinoid process sphenoid bone |
| 23
.
| Sphenoidal sinus (anterior boundaries are not clearly defined) |
| 24
.
| Infundibular recess third ventricle |
| 25
.
| Inferior horn of lateral ventricle right |
| 26
.
| Pineal recess |
| 27
.
| Cerebral aqueduct |
| 28
.
| Suprapineal recess |
| 29
.
| Margins of operative resection of occipital bone |
