RT Book, Section A1 Lueder, Gregg T. SR Print(0) ID 56151085 T1 Chapter 26. Disorders of the Orbit T2 Pediatric Practice: Ophthalmology YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 9780071633802 LK accesspediatrics.mhmedical.com/content.aspx?aid=56151085 RD 2024/10/15 AB The orbit is the space in the skull in which the eye and extraocular muscles are located. It is cone-shaped, widest anteriorly and tapering to the orbital apex, through which the optic nerve passes. The orbits are demarcated by the bones of the skull (Figure 26–1). The roof consists of a portion of the frontal bone and the lesser wing of the sphenoid bone. The frontal lobes of the brain lie above this area. The medial orbital wall is composed of the lacrimal bone and portions of the ethmoid, maxilla, and sphenoid bones. The ethmoid sinuses are adjacent to this wall. The floor of the orbit is composed of the maxilla and a portion of the zygomatic bone. It lies above the maxillary sinus. The lateral wall is formed by the zygomatic bone and the greater wing of the sphenoid.