1
.
| Frontal sinus (ethmofrontal) |
2
.
| Ethmoidal cells (along medial wall of orbit) |
3
.
| Sphenoidal sinus (in bâckground) |
4
.
| Borders of Nasolacrimal canal (in foreground) |
5
.
| Supraorbital margin |
6
.
| Temporal line of frontal bone |
7
.
| Zygomaticofrontal suture |
8
.
| Outline of posterior opening of optic canal |
9
.
| Superior orbital fissure |
10
.
| Outline of optic foramen (anterior opening of optic canal) |
11
.
| Anterior clinoid process (lower pointer indicates tip of this process) |
12
.
| Zygomatic bone |
13
.
| Anterior limit of inferior orbital fissure |
14
.
| Infraorbital margin |
15
.
| Infraorbital foramen (maxillary sinus underlies floor of orbit in this region) |