Dissection of right orbit from a superior approach

General relations of structures within orbit; orbital fascia

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Image #54-1
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Dissection of right orbit from a superior approach
General relations of structures within orbit; orbital fascia
Bone has been cut away from the roof of the orbit and the ethmoidal sinuses opened. The periorbita has been resected and the orbital fat removed. The arrangement of muscle fascia anteriorly in the orbit is of particular interest. The muscles have not yet been stripped of intrinsic fascia, but this is so thin posteriorly that it is barely discernable except over the superior oblique muscle (12). The fascia becomes dense only where the muscles approach the eye. Here it spreads away from the muscle borders into neighboring areas.
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