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Nov 3, 2023 · The apex of the orbit is the optic foramen (canal), bound medially by the body of the sphenoid bone and laterally by the lesser wing of the sphenoid bone. It is medial to the superior orbital fissure. The optic foramen provides passage for the optic nerve (CN II) and ophthalmic artery to exit the skull.
- Maxillary Sinus
The maxillary sinus is the largest paranasal sinus situated...
- Lacrimal Apparatus
Lacrimal artery (lateral-left view) The facial nerve leaves...
- Maxillary Sinus
Jun 25, 2024 · Inferior orbital fissure – transmits the zygomatic branch of the maxillary nerve, the inferior ophthalmic vein, and sympathetic nerves. There are other minor openings into the orbital cavity. The nasolacrimal canal, which drains tears from the eye to the nasal cavity, is located on the medial wall of the orbit.
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- Structure
- Location
- Function
- Clinical Significance
The orbital cavity is a four-walled, pyramid-shaped structure that is formed by several bones of the skull, including the frontal bone, zygomatic bone, sphenoidbone, and ethmoid bone. The orbital cavity is bounded by the orbital margin, a bony ridge that encircles the orbit and separates it from the surrounding facial structures. It is divided into...
The orbital cavities are located within the skull, one on each side of the head. They are situated in the frontal bone, just above the nasal cavity and below the frontal lobe of the brain. The orbital cavities are separated by a thin partition of bone called the septum orbitale. They are located in a strategic position within the skull, providing p...
The main function of the orbital cavity is to house and protect the eye and its associated structures. The orbital cavity provides a stable and supportive environment for the eye, allowing it to move and function properly. The orbital cavity also plays a vital role in vision. The eye is able to move within the orbital cavity, allowing it to focus o...
The orbital cavity is susceptible to a variety of disorders and conditions that can affect the eye and its associated structures. Some of the more common disorders that can affect the orbital cavity include orbital cellulitis, orbital fractures, and orbital tumors.
- Base. Also called the orbital margin or rim, it is the side of the orbit that opens toward the front of the face. It is bordered by the eyelids and has the following 4 margins
- Apex. It is the posteromedial surface pointing towards the skull. This side of the cavity is bound by the sphenoid bone. This is where the optic foramen opens up into the optic canal.
- Roof. It is the superior wall of the orbital cavity, bound by the frontal bone and the sphenoid’s lesser wing. This is the wall that marks the division between the orbital cavity and the anterior cranial fossa.
- Medial Wall. As the name suggests, this is located medially or towards the side of the nose. 4 bones contribute to forming this wall – ethmoid, lacrimal, maxilla, and sphenoid.
Jul 24, 2023 · The orbital cavity contains the globe, nerves, vessels, lacrimal gland, extraocular muscles, tendons, and the trochlea as well as fat and other connective tissue. An increase in the volume of the extraocular structures within the orbit can cause proptosis, which is protrusion of the globe and/or displacement (deviation) of the globe from its normal position.
- Caleb L. Shumway, Mahsaw Motlagh, Matthew Wade
- 2023/07/24
- 2021
The orbital cavities are large bony sockets that house the eyeballs with associated muscles, nerves, blood vessels and fat. Each orbit is pear-shaped with the optic nerve representing the stem. The medial walls of the orbit are almost parallel and border the nasal cavity anteriorly. The lateral walls, however, diverge at an angle of 45 degrees.
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The superior wall - or roof of the orbit - is mainly formed by the orbital part of the frontal bone anteriorly, and a small posterior part by the lesser wing of the sphenoid bone. The lateral wall is made up of the zygomatic bone anteriorly and the greater wing of the sphenoid bone posteriorly. Finally, the inferior wall - or floor of the orbit ...
