Dissection of left orbit from an anterior approach

Orbital septum; tarsal plates; insertion of levator palpebrae superioris muscle

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Image #52-6
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Dissection of left orbit from an anterior approach
Orbital septum; tarsal plates; insertion of levator palpebrae superioris muscle
The aponeurosis of the levator palpebrae superioris muscle has been partially elevated to illustrate its insertion (18) into the anterior surface of the tarsus. Laterally the aponeurosis has been reflected (16) to expose the tarsal muscle (17), a layer of smooth muscle which extends between the superior margin of the tarsal plate and the deep surface of the aponeurosis of the levator palpebrae muscle. This layer is known as M|ller's muscle.
1 . Corrugator supercilii muscle
2 . Supraorbital nerve
3 . Supratrochlear nerve
4 . Infratrochlear nerve
5 . Angular vein
6 . Middle palpebral artery (cut across)
7 . Dorsal nasal artery emerging from orbit
8 . Lacrimal part of orbicularis oculi muscle (cut across)
9 . Medial palpebral ligament
10 . Small artery in periosteum
11 . Origin of inferior portion of orbicularis oculi muscle
12 . Angular head of levator labii superioris muscle
13 . Branches of facial nerve which supply above muscle
14 . Supraorbital margin and zygomatico-orbital artery
15 . Orbital septum
16 . Aponeurosis of levator palpebrae superioris muscle
17 . Superior tarsal muscle (muscle of Mùˆller)
18 . Insertion of aponeurosis of levator palpebrae superioris muscle into superior tarsus
19 . Superior palpebral nerve
20 . Superior tarsus (Meibomian glands visible)
21 . Lacrimal nerve and artery
22 . Inferior tarsus
23 . Fat beneath orbicularis oculi muscle
24 . Branch of facial nerve to orbicularis oculi muscle
25 . Branch of external maxillary artery which enters orbit
26 . Inferior palpebral branch of infraorbital nerve