Anatomy Of Orbital Floor
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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.
Anatomy of orbital floor. Blowout fractures can occur through one or more of the orbital walls. The key areas of the orbit involve mainly the posterior orbital floor and medial orbital wall which bulge towards the orbit resulting in an s shape of the orbital floor in the posterior third seen in a sagittal view along the axis of the optic nerve. Floor or inferior wall roof or superior wall medial wall. The bones that contribute to.
It transmits the infra orbital nerve which can be harmed in blow out fractures resulting in parasthesia below the lower eyelid. Inferior floor medial wall lamina papyracea superior roof lateral wall. Medially near the orbital margin is located the groove for nasolacrimal duct. Orbital fat prolapses into the maxillary sinus and may be joined by prolapse of the inferior rectus muscle.
Near the middle of the floor located infraorbital groove which leads to the infraorbital foramen. Inferior blowout fractures are the most common. The orbital floor specific knowledge of maxillary endoscopic anatomy is required. In the adult the orbit has a volume of approximately 30 ml of which the globe occupies 6 5 ml.
The inferior orbital fissure lies just below the superior orbital fissure between the lateral wall and floor of the orbit. The purpose of the study was to provide an anatomic description of the orbital floor via the endoscopic approach. It has a roof floor medial and lateral wall. The orbital floor is the shortest of all the walls.
Using 0 and 30 degree rigid endoscopes 6 fresh cadavers 12 maxillary sinuses were. The inferior orbital neurovascular bundle comprising the infraorbital nerve and artery courses within the bony floor of the orbit. Objectives include defining consistent landmarks for use in endoscopic repair of orbital floor fractures. The bony orbital walls are referred to as the.
It is important to consider the unique contours of the orbital anatomy. 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. The most important landmark of the floor is the inferior orbital fissure. It separates the floor from the lateral wall and provides passage for several neurovascular structures.
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. The roof of this infraorbital canal is only 0 23mm thick and the bone of the posterior medial orbital floor averages 0 37 mm thick.
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