|
| Apex of orbit |
| Sheath of optic nerve, annular tendon, oculomotor foramen |
| The optic nerve and its sheath has been cut across close to the optic foramen. The annular tendon (8) is fused medially and superiorly with the sheath. It is separated from the sheath inferiorly and laterally to form the oculomotor foramen for the entry of the nasociliary branch of the ophthalmic nerve (17), the oculomotor nerve (11,17,23,24) and the abducens nerve (19) into the central part of the orbit from the superior orbital fissure. The opthalmic artery (18), in its passage through the optic canal an foramen, is embedded in the sheath of the optic nerve. The superior ophthalmic vein has been removed. |
| 1
.
| Frontal nerve | | 2
.
| Upper pointer: Superior rectus muscle Lower pointer: Subarachnoid space | | 3
.
| Levator palpebrae superioris muscle | | 4
.
| Optic nerve (II) | | 5
.
| Sheath of optic nerve | | 6
.
| Trochlear nerve (IV) | | 7
.
| Superior oblique muscle | | 8
.
| Common annular tendon | | 9
.
| Oculomotor foramen | | 10
.
| Periorbita | | 11
.
| Inferior branch of oculomotor nerve (III) (branch to medial rectus muscle) | | 12
.
| Medial rectus muscle | | 13
.
| Ethmoidal cells (mucosa abnormally thickened) | | 14
.
| Greater wing of sphenoid (cut across) | | 15
.
| Recurrent meningeal branch of lacrimal artery | | 16
.
| Lacrimal nerve | | 17
.
| Upper pointer: Superior branch of oculomotor nerve (III) Lower pointer: Nasociliary nerve | | 18
.
| Ophthalmic artery | | 19
.
| Abducens nerve (VI) | | 20
.
| Ciliary ganglion | | 21
.
| Lateral rectus muscle | | 22
.
| Temporalis muscle | | 23
.
| Inferior branch of oculomotor nerve (III) (branch to inferior oblique muscle) | | 24
.
| Inferior branch of oculomotor nerve (III) (branch to Inferior rectus muscle) | | 25
.
| Inferior rectus muscle | | 26
.
| Orbital muscle (muscle of Müller) |
|
|
