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Dissection of right orbit from a superior approach

Insertion of levator palpebrae superioris muscle, anterosuperior view

Image #54-3

KEYWORDS: Eye, Face, Muscles and tendons.

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Dissection of right orbit from a superior approach

Insertion of levator palpebrae superioris muscle, anterosuperior view

The aponeurosis of insertion of the levator palpebrae superioris muscle (6) has been exposed. The superior part of the lacrimal gland has been cut away and the fascia removed from the aponeurosis. The upper eyelid (13) has been dissected to display the extension of this aponeurosis onto the anterior surface of the tarsus (12) as well as its attachment to the skin anterior to the tarsus (14). This insertion is also visible in reel 52-3. The insertion of the lateral "horn" of the aponeurosis into the orbital tubercle of the zygoma is visible at 11. The medial "horn" of the aponeurosis (23) extends downward toward the medial wall of the orbit. Variation in thickness of the bone of the lateral wall of the orbit is well shown in this view.

1 .	Middle cranial fossa
2 .	Sheath of optic nerve
3 .	Lateral rectus muscle
4 .	Superior rectus muscle
5 .	Temporalis muscle (within temporal fossa)
6 .	Levator palpebrae superioris muscle and its aponeurosis
7 .	Lacrimal nerve
8 .	Lateral check ligament
9 .	Area for lacrimal gland
10 .	Frontosphenoidal process of zygomatic bone
11 .	Lateral horn of aponeurosis of levator palpebrae superioris muscle
12 .	Aponeurosis of levator palpebrae superioris muscle extending to anterior surface of superior tarsus
13 .	Superior palpebra
14 .	Cutaneous insertion of fibers of aponeurosis of levator palpebrae superioris muscle (partially cut across)
15 .	Ethmoidal cell (medial)
16 .	Superior oblique muscle
17 .	Medial rectus muscle
18 .	Ophthalmic artery
19 .	Ethmoidal cell (anterior)
20 .	Frontal sinus
21 .	Superior oblique muscle
22 .	Fascia surrounding reflected part of tendon of superior oblique muscle
23 .	Medial horn of aponeurosis of Ievator palpebrae superioris muscle
24 .	Frontal artery
25 .	Corrugator supercilii muscle