Orbit (anatomy)
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| Orbit (anatomy) | |
|---|---|
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| The seven bones which articulate to form the orbit. yellow = Frontal bone blue = Zygomatic bone purple = Maxillary bone red = Sphenoid bone brown = Ethmoid bone aqua = Palatine bone green = Lacrimal bone |
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| Gray's | subject #46 188 |
| MeSH | Orbit |
| Dorlands/Elsevier | o_05/12594914 |
In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.
It can also mean the skin which surrounds the eye of a bird.
Contents |
[edit] Contents
- Eyeball
- Fascias: Orbital, Bulbar
- Extraocular muscles
- Nerves: cranial nerves II, III, IV, V, and VI
- Blood vessels
- Fat
- lacrimal gland
[edit] Bones
In humans, seven bones make up the bony orbit:
- Frontal bone (Pars orbitalis)
- Zygomatic bone (Orbital process of the the zygomatic bone)
- Maxillary bone (Orbital surface of the body of the maxilla)
- Sphenoid bone (Orbital surface of greater wing of sphenoid bone)
- Ethmoid bone (Lamina papyracea)
- Palatine bone (Orbital process of palatine bone)
- Lacrimal bone
[edit] Foramina and openings
- Optic foramen
- Superior orbital fissure
- Inferior orbital fissure
- Anterior ethmoid foramen
- Posterior ethmoidal foramen
- Infraorbital foramen
- Supraorbital foramen
- Naso-lacrimal canal opening
- Zygomatic orbital foramen
[edit] Additional images
 The skull from the front. |
 Medial wall of left orbit. |
 Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure. |
 Coronal section of nasal cavities. |
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 Lateral orbit anatomy |
 Lateral orbit nerves |
[edit] External links
- eMedicine oph/2 - "Arterial Supply, Orbit"
- SUNY Labs 29:os-0501
- Atlas of anatomy at UMich eye_5
- Atlas of anatomy at UMich rsa2p4
- Interactive tutorial at anatome.ncl.ac.uk
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