- Orbit: paired pyramidal bony cavity lodging the eyeball, its muscles, nerves and vessels; apex behind at the optic canal, base in front at the orbital margin.
Boundaries and Walls of the Orbit
- Four walls: medial (thinnest), lateral (strongest), floor and roof.
orbital margins and the bones forming its walls Orbital margins and the bones forming its walls.
Bones forming the walls of the orbit
Wall
Medial (thinnest)
- Bones
- Frontal process of maxilla, lacrimal bone, orbital plate of ethmoid, body of sphenoid
Lateral (strongest)
- Bones
- Zygomatic bone (front), greater wing of sphenoid (behind)
Floor
- Bones
- Body of maxilla, zygomatic bone (anterolateral), orbital process of palatine (posteromedial)
Roof
- Bones
- Orbital plate of frontal bone (front), lesser wing of sphenoid (behind)