Orbital Roof Bone Anatomy

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. The orbital plate of the frontal bone forms the anterior aspect of the orbital roof. The orbital roof is formed by two bones.

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The lesser wing of the sphenoid bone forms the posterior aspect of the orbital roof.

Orbital roof bone anatomy.

The orbital surface presents medially by trochlear fovea and laterally by lacrimal. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. Orbital roof the orbital roof consists of two bones. The frontal bone contains the lacrimal gland fossa temporally and the trochlear fossa nasally.

It can be extremely thin frequently with dehiscent spots in elderly individuals. It has a roof floor medial and lateral wall. Gross anatomy in the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml. 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.

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 orbital process of the zygomatic bone. 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. 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.

This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins. Roof of the orbit the superior wall is triangular and has a domed contour in the anterior orbital one third and the midorbit. The frontal and sphenoid bone lesser wing. 9 2 9 3 and 9 4.

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. Roof ptosis contributes to eyebrow ptosis in the aging face. Superior orbital fissure lies between the lesser and the greater wing of sphenoid. 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. It is a thin lamina separating the orbit anteriorly from the frontal sinus and posteriorly from the anterior cranial fossa. The orbital roof which is the floor of the anterior cranial fossa consists of the frontal and lesser wing of sphenoid bones. It is mainly comprised of the horizontal orbital plate of the frontal bone.

Brow elevation lifts the roof. It is not a good idea to remove the roof figs. The orbit is open anteriorly where it is bound by the orbital septum which forms part of the eyelids.

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