Orbital Roof Bone Anatomy

Brow elevation lifts the roof.

Orbital roof bone anatomy.

Roof ptosis contributes to eyebrow ptosis in the aging face. The frontal and sphenoid bone lesser wing. The frontal bone contains the lacrimal gland fossa temporally and the trochlear fossa nasally. The superior bony margin of the orbital rim otherwise known as the orbital process is formed by the frontal bone.

The orbital roof is formed by two bones. The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids. The orbital surface presents medially by trochlear fovea and laterally by lacrimal. 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.

Gross anatomy in the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. The orbital roof is composed of the orbital plate of the frontal bone with a small contribution from the lesser wing of the sphenoid at the apex figures 3 4 and 3 5. Orbital roof the orbital roof consists of two bones. 9 2 9 3 and 9 4.

It can be extremely thin frequently with dehiscent spots in elderly individuals. Roof of the orbit the superior wall is triangular and has a domed contour in the anterior orbital one third and the midorbit. The roof is analogous to the soof except that it is located in the upper eyelid deep to the orbicularis oculi and above the orbital fat pads in a separate layer. It is mainly comprised of the horizontal orbital plate of the frontal bone.

It has a roof floor medial and lateral wall. The orbital plate of the frontal bone forms the anterior aspect of the orbital roof. The lesser wing of the sphenoid bone forms the posterior aspect of the orbital roof. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall.

It is not a good idea to remove the roof figs. The supraorbital notch or foramen through which the supraorbital nerve cn v 1 and vessels travel divides the medial one third and lateral two thirds of the superior orbital rim. Superior orbital fissure lies between the lesser and the greater wing of sphenoid. Maxillary bone anterior inferior portion sphenoid bone.

This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins. It is a thin lamina separating the orbit anteriorly from the frontal sinus and posteriorly from the anterior cranial fossa. 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.