| 1
.
| Frontal sinus (opened) |
| 2
.
| Position of superior oblique muscle |
| 3
.
| Branch of frontal nerve which communicates with infratrochlear nerve |
| 4
.
| Fascia of superior oblique muscle |
| 5
.
| Ophthalmic artery |
| 6
.
| Olfactory nerve (I) |
| 7
.
| Infratrochlear nerve |
| 8
.
| Superior ophthalmic vein |
| 9
.
| Olfactory bulb |
| 10
.
| Anterior ethmoidal nerve |
| 11
.
| Ethmoidal air cell (medial) |
| 12
.
| Superior oblique muscle |
| 13
.
| Upper pointer: Posterior ethmoidal artery Lower pointer: Ethmoidal cell (posterior) |
| 14
.
| Trochlear nerve (IV) |
| 15
.
| Roof of optic canal (upper root of lesser wing of sphenoid bone |
| 16
.
| Dura mater and optic nerve (II) |
| 17
.
| Anterior clinoid process |
| 18
.
| Supratrochlear nerve |
| 19
.
| Frontal nerve (supraorbital and frontal branches not separated) |
| 20
.
| Fascia of levator palpebrae superioris muscle |
| 21
.
| Levator palpebrae superioris muscle |
| 22
.
| Fascia of superior rectus muscle |
| 23
.
| Periorbita |
| 24
.
| Superior rectus muscle |
| 25
.
| Lacrimal nerve, artery, and vein |
| 26
.
| Temporalis muscle |
| 27
.
| Superior ophthalmic vein |
| 28
.
| Frontal nerve |
