What is inferior orbital fissure?
The inferior orbital fissure (IOF) lies in the floor of the orbit inferior to the superior orbital fissure and it is bounded superiorly by the greater wing of sphenoid, inferiorly by maxilla and orbital process of palatine bone and laterally by the zygomatic bone. It opens into posterolateral aspect of orbital floor.
What are the superior and inferior orbital fissure?
The superior orbital fissure is bounded by the lesser and greater wings of the sphenoid. The greater wing of the sphenoid, the maxilla, and the palatine bones of the orbit form the boundaries of the inferior orbital fissure. The optic canal is at the apex of the orbit and lies within the sphenoid bone.
Where is the orbital fissure?
Anatomical terms of bone The superior orbital fissure is a foramen or cleft in the skull. It lies between the lesser and greater wings of the sphenoid bone.
What bone is needed to form the inferior orbital fissure?
The inferior orbital fissure is formed by the sphenoid bone and the maxilla. It is located posteriorly along the boundary of the floor and lateral wall of the orbit. It transmits a number of structures, including: the zygomatic branch of the maxillary nerve.
What exits the inferior orbital fissure?
The infraorbital vessels are found in the inferior orbital fissure, and travel down the infraorbital groove into the infraorbital canal and exit through the infraorbital foramen. It is formed by the sphenoid bone and maxilla.
What is the function of the superior orbital fissure?
Function. The superior orbital fissure functions as a bony aperture through which many important structures pass from the brain into the orbit.
What is the role of superior orbital fissure?
What exits inferior orbital fissure?
The lateral wall and the floor of the orbit are separated posteriorly by the inferior orbital fissure which transmits the maxillary nerve and its zygomatic branch, and the ascending branches from the pterygopalatine ganglion.
What nerves go through the orbital fissure?
This fissure, which separates the greater and lesser wings of the sphenoid and lies between the optic foramen and the foramen rotundum, provides passage to the three motor nerves to the extraocular muscles of the orbit: oculomotor nerve (CN III), trochlear nerve (CN IV), and abducens nerve (CN VI).
What is Zinn annulus?
Definition. The annulus of Zinn is a dense, fibrous ring of connective tissue located at the apex of the orbit that is the origin of four of the six extraocular muscles – the superior rectus, inferior rectus, lateral rectus, and medial rectus.
What nerves go through the superior orbital fissure?
What exits the superior orbital fissure?
The lacrimal, frontal and trochlear nerves, as well as the ophthalmic vein, pass through the superior orbital fissure outside of the annulus of Zinn. The superior and inferior divisions of cranial nerve III, cranial nerve VI, and the nasociliary nerve pass through the fissure within the Annulus of Zinn.