Orbit (anatomy)

2007 Schools Wikipedia Selection. Related subjects: Health and medicine

Orbit (anatomy)
The skull from the front.
Medial wall of left orbit.
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. Extraocular muscles
2. Nerves: cranial nerves II, III, IV, V, and VI
3. Vasculature
4. Adipose tissue

Bones

In humans, seven bones make up the bony orbit:

1. Frontal bone
2. Zygomatic bone
3. Maxillary bone
4. Sphenoid bone
5. Ethmoid bone
6. Palatine bone
7. Lacrimal bone

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