Bones what is the orbit

The bony orbit refers to the bones that constitute the margins of the orbits , that is the roof, medial and lateral walls and floor.

The orbital margin or rim refers to the anterior circular margin of the orbit. The orbital apex refers to the posterior confluence of the orbit, where the optic canal , superior orbital fissure and inferior orbital fissure transmit nerves and vessels into the orbit.

The four bones of the medial wall are remembered with this mnemonic. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait. Unable to process the form. Check for errors and try again.

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About Recent Edits Go ad-free. Edit article. View revision history Report problem with Article. Citation, DOI and article data. Hacking, C. Bony orbit. Reference article, Radiopaedia. URL of Article. There are seven bones that contribute to the bony orbit: pars orbitalis of the frontal bone lacrimal bone lamina papyracea of the ethmoid bone orbital process of the zygomatic bone orbital surface of the maxillary bone orbital process of the palatine bone greater and lesser wings and body of the sphenoid bone The four bones of the medial wall are remembered with this mnemonic.

A blowout fracture can be the result of being hit in the eye with a baseball or a fist. Significant eye trauma can cause the orbital bone and surrounding structures to cave downward into the socket.

Such trauma can also affect the surrounding eye muscles, making eye movement harder and more painful. Orbital rim fractures typically result from car accidents and similar traumatic events.

This type of fracture affects the outer part of the orbital bone and is usually caused by a great deal of force or impact. Depending on the manner of trauma, orbital rim fractures may be associated with other facial injuries. Depending on the severity, vision can be affected by an orbital bone injury or fracture.

In general, orbital bone injuries can cause blurry vision, difficulty moving the eye and bruising around the eye.

Blood in the eye subconjunctival hemorrhage. Eyeballs that are sunken or bulging. If an orbital bone or the area around it is injured, it should be checked by an ophthalmologist as soon as possible for signs of a fracture or break. Evaluating an orbital bone typically involves tests such as a CT scan, X-rays and other imaging. Many cases do not require surgery for treatment, and the eye is able to heal on its own with the help of antibiotics, decongestants and ice packs to reduce swelling.

Severe orbital bone fractures that impact the movement of the eye or that cause the eyeball to be repositioned are more likely to require surgery. The bruising and swelling caused by an orbital fracture usually heals within 7 to 10 days, while the fracture itself takes longer to heal completely — the exact time frame depends on the level of impact and severity of the injury.