Orbit

Dr Craig Hacking and A.Prof Frank Gaillard et al.

The orbit is a feature of the face and contains the globe and it's supporting structures, as well as many nerves and vessels.

In the adult, the orbit has a volume of approximately 30 mL, of which the globe occupies 6.5 mL. It has a roof, floor, medial and lateral wall. The orbit is open anteriorly where it is bound by the orbital septum, which forms part of the eyelids. Posteriorly, the orbit angles inward such that their apices communicate with the intracranial compartment via the optic canal and superior orbital fissure.

The bony margins of the orbits, known as the bony orbit, are composed of seven bones:

The four bones of the medial wall are remembered with this mnemonic.

The orbit is divided by the musculofascial cone into 2 separate compartments:

The orbit communicates posteriorly with the intracranial cavity via the optic canal, through which the optic nerve and ophthalmic artery is transmitted. Immediately inferolateral to the optic canal is the superior orbital fissure, through which most neurovascular structures pass. The infratemporal fossa is accessed via the inferior orbital fissure, which is in direct continuation with the infraorbital foramen, through which the infraorbital nerve exits to supply the skin below the eye (and where it is often damaged by a blow-out fracture).

Medially, small communications with the paranasal sinuses are via the anterior ethmoidal foramen and posterior ethmoidal foramen.

Anteriorly, the supraorbital notch is closed inferiorly by the orbital septum forming a fibrous supraorbital foramen. The nasolacrimal duct drains the nasolacrimal sac via the nasolacrimal foramen.

There are many nerves within the orbit: see orbital nerve supply.

The fascial sheath of the eye (Tenon's fascia), orbital fat, obliques and bony attachment of the recti provide stability to the eyeball within the orbit and prevent it from sinking or retracting. 

The fascial sheath of the eye (Tenon's fascia) prevents the eye from sinking. The fascia is applied like a bursa to the back of the eye, from the corneoscleral junction to the attachment of the optic nerve and is thickened over the extraocular muscles.

Over the lateral rectus, the tubular prolongation is thickened to form the lateral check ligament, which attaches to the marginal tubercle of Whitnall (bony elevation at the orbital surface of the zygoma). Over the medial rectus, this prolongation is thickened to form the medial check ligament, which attaches to the posterior lacrimal crest (of the lacrimal bone). Between these ligaments, the inferior part of the sheath is thickened to form the suspensory ligament of Lockwood, which supports the eye within the orbit. 

The eye does not rest on the orbital floor but is held up (in fact, closer to the roof) by the suspensory ligament. As a result, the whole maxilla can be removed with the medial orbital wall up to the marginal tubercle without descent of the eye. Above this level removal of bone destroys the attachment of the suspensory ligament, hence the eye sinks down, and diplopia results. 

The eyes always rotate about a fixed centre, which is its own geometrical centre. The contracting recti muscles do not displace the eye posteriorly due to:

  1. bony attachment of the recti
  2. presence of orbital fat
  3. forward pull of the obliques
Head and neck anatomy
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Article information

rID: 1780
Section: Anatomy
Synonyms or Alternate Spellings:
  • The orbit
  • Orbit anatomy

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Cases and figures

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    Figure 1: lateral view
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    Figure 2: anterior view
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    Figure 3: superior view
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    Figure 4: schematic of innervation
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    Figure 5: orbit AP bone
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    Figure 6
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    Bones of the orbi...
    Figure 7: bones of the orbit
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    Figure 8: orbital apex diagram
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    Lateral view of t...
    Figure 9: anatomy of the eye and extraocular muscles
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    Anterior view of ...
    Figure 10: anatomy of the eye and extraocular muscles
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    Internal structur...
    Figure 11: anatomy of the eye and extraocular muscles
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    Position of attac...
    Figure 12: anatomy of the eye and extraocular muscles
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    Lateral view of t...
    Figure 13: anatomy of the eye and extraocular muscles
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