Orbital Roof Bone Anatomy

Blowout fracture this refers to partial herniation of the orbital contents through one of its walls.

Orbital roof bone anatomy.

The frontal bone contains the lacrimal gland fossa temporally and the trochlear fossa nasally. 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. Obviously rote memorization is pretty simple since there are only two bones. The superior bony margin of the orbital rim otherwise known as the orbital process is formed by the frontal bone.

Maxillary bone anterior inferior portion sphenoid bone. The roof superior wall is formed primarily by the orbital plate frontal bone and also the lesser wing of sphenoid near the apex of the orbit. The frontal and sphenoid bone lesser wing. Superior orbital fissure lies between the lesser and the.

The only important landmark of this wall is the anterolaterally located depression called the lacrimal fossa intended for hosting the orbital part of the lacrimal gland. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. The orbital surface presents medially by trochlear fovea and laterally by lacrimal. The orbital roof which is the floor of the anterior cranial fossa consists of the frontal and lesser wing of sphenoid bones.

In the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. The zygomatic and the sphenoid bone greater wing. The largest contributor of the roof is the orbital part of the frontal bone while the small posterior portion is completed by the lesser wing of the sphenoid bone. Sphenoid zygomatic maxillary palatine bones communicates orbit with inf temporal fossa and pterygopalatine fossa lies between lateral wall and floor of the orbit.

This usually occurs via blunt force trauma to the eye. Orbital process of the frontal bone orbital process of the zygomatic bone. The bony orbital walls are referred to as the. The lesser wing of the sphenoid bone forms the posterior aspect of the orbital roof.

The orbital floor extends from the rim to approximately two thirds of the depth of the orbit where it curves medially as the posterior medial border of the inferior orbital fissure and blends with the medial wall. Inferior orbital fissure the infra orbital fissure is a 20 mm bony defect bounded by the. There are many ways to remember these bones. The orbital roof is formed by two bones.

Orbital rim fracture this is a fracture of the bones forming the outer rim of the bony orbit. It usually occurs at the sutures joining the three bones of the orbital rim the maxilla zygomatic and frontal. Floor or inferior wall roof or superior wall medial wall. Seven orbital bones compose the four walls of the orbit fig.

The orbital roof consists of two bones.