Orbit (anatomy)

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Orbit (anatomy)
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
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 1 Contents 2 Bones 3 Foramina and openings 4 Additional images 5 External links

[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

1. Optic foramen
2. Superior orbital fissure
3. Inferior orbital fissure
4. Anterior ethmoid foramen
5. Posterior ethmoidal foramen
6. Infraorbital foramen
7. Supraorbital foramen
8. Naso-lacrimal canal opening
9. 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.
	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