Superior Orbital Floor

The superior orbital rim presents the superior orbital notch or foramen which allows passage of the supraorbital neurovascular bundle. Medially near the orbital margin is located the groove for nasolacrimal duct. An orbital blowout fracture is a traumatic deformity of the orbital floor or medial wall typically resulting from impact of a blunt object larger than the orbital aperture or eye socket most commonly the inferior orbital wall i e.

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Special Parts Of The Skull Sphenoid Bone Paranasal Sinuses Body

Trauma to the frontal bar of the superior orbital rim can cause a buckling of this bone in addition to fractures of the contralateral orbit.

Superior orbital floor. The floor of the frontal sinus is the roof of the orbit comprised of the frontal bone and lesser wing of the sphenoid. The superior orbital fissure is a bony cleft found at the orbital apex between the roof and lateral wall. This bundle may be damaged in rim fractures or in surgical. Disruption of the mucosal integrity of the maxillary or ethmoidal sinus may result in subcutaneous or intraorbital emphysema.

Infraorbital nerve with its anterior superior alveolar branch hypesthesia is reported in as many as 60 of orbital floor blow out fractures and in 71 of inferior orbital rim fractures. Orbital emphysema is common when the frontal sinus is involved. The floor is likely to collapse because the bones of the roof and lateral walls are robust. It is a communication between the orbital cavity and middle cranial fossa and is bounded by the greater wing lesser wing and body of sphenoid its dimensions are 22mm in length and 2 8mm in width narrowest and widest parts and it is pear shaped with a wide base nasally on the body of.

The floor inferior wall is formed by the orbital surface of maxilla the orbital surface of zygomatic bone and the minute orbital process of palatine bone. Near the middle of the floor located infraorbital groove which leads to the infraorbital foramen.

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