Bassett Collection of Stereoscopic Images of Human Anatomy

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Dissection of left orbit from an anterior approach

Orbital septum; corrugator supercilii muscle

Image #52-4

KEYWORDS: Connective tissue, Eye, Face, Muscles and tendons, Peripheral nervous system, Vasculature.

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Dissection of left orbit from an anterior approach

Orbital septum; corrugator supercilii muscle

The orbicularis oculi muscle has been cut away and the connective tissue beneath removed to expose nerves, vessels and fascial structures of the upper lid. The layer of fat (18) originally extended medially between the orbicularis muscle (5) and the orbital septum (16).

1 .	Frontalis muscle
2 .	Corrugator supercilii muscle
3 .	Supratrochlear nerve
4 .	Infratrochlear nerve
5 .	Orbicularis oculi muscle (divided and partially removed)
6 .	Medial palpebral artery (note branch which passes superiorly to communicate with supraorbital artery)
7 .	Cut end of lacrimal part orbicularis oculi muscle (superior portion of Horner's muscle)
8 .	Medial palpebral ligament
9 .	Nasal bone (covered by periosteum)
10 .	External nasal branch anterior ethmoidal nerve
11 .	Angular artery and vein
12 .	Frontalis muscle
13 .	Branch supraorbital nerve (communicates in part with temporal branch of facial nerve)
14 .	Frontal nerve (note contribution to palpebral nerves)
15 .	Supraorbital margin of orbit (periosteum intact)
16 .	Orbital septum
17 .	Superior palpebral branches of frontal, supratrochlear, and infratrochlear nerves
18 .	Layer of fat beneath orbicularis oculi muscle
19 .	Aponeurosis of levator palpebrae superioris muscle
20 .	Superior tarsus
21 .	Lacrimal nerve