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Dissection of left orbit from a lateral approach

Lateral rectus muscle; communication of lacrimal and zygomatic nerves

Image #55-4

KEYWORDS: Bones cartilage joints, Cheek, Connective tissue, Eye, Face, Muscles and tendons, Peripheral nervous system.

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Dissection of left orbit from a lateral approach

Lateral rectus muscle; communication of lacrimal and zygomatic nerves

The periorbita has been resected and the bony walls of the orbit cut away more than previously. A thin layer of fat separated the lateral rectus muscle from the periorbita. This fat has been removed from along with that surrounding other structures within the orbit. The fascia of the lateral rectus muscle is intact, but is extremely thin through most of its extent. Anteriorly the fascia thickens rapidly and has a broad attachment to the orbital tubercle of the zygomatic bone to form the lateral check ligament (6).

1 .	Supraorbital nerve
2 .	Superior lacrimal gland
3 .	Anastomotic branch of lacrimal nerve with zygomatic nerve
4 .	Periorbita (split into two layers to enclose lacrimal gland)
5 .	Lateral palpebral raphe
6 .	Lateral check ligament
7 .	Tunica conjunctiva
8 .	Fascia forming suspensory ligament for eye
9 .	Inferior oblique muscle
10 .	Dura mater of anterior cranial fossa
11 .	Superior rectus muscle
12 .	Lacrimal artery and nerve
13 .	Middle meningeal artery (anterior branch)
14 .	Superior ophthalmic vein (lacrimal veins visible as tributaries)
15 .	Lateral rectus muscle
16 .	Branch of oculomotor nerve (III) to inferior oblique muscle
17 .	Inferior ophthalmic vein (situated in periorbita which bridges across inferior orbital fissure)
18 .	Zygomatic nerve
19 .	Infraorbital nerve
20 .	Orbital muscle (of Müller)