MRCP UK EXAMINATIONS

Detailed explanation-1: -The inferior orbital fissure lies on the floor of the orbit. The superior border is the greater wing of the sphenoid, and the maxilla and palatine bone compose the inferior border, with the zygomatic bone laterally.

Detailed explanation-2: -parva) of the sphenoid bone forms part of the orbital roof, and the ala major part of the lateral wall of the orbit. Its external surface is related to the temporal, infratemporal, and pterygopalatine fossa. The medial part of the sphenoid ridge is formed by the ala minor, and the lateral part by the ala major.

Detailed explanation-3: -The orbit is a bony pyramid with four walls: a roof, lateral wall, floor, and medial wall.

Detailed explanation-4: -The IOF or sphenomaxillary fissure is defined as a space between the lateral wall and floor of the orbit. This fissure runs in an anterolateral direction from the maxillary strut posteriorly to the zygomatic bone anteriorly. The IOF joins the orbit with the pterygopalatine, infratemporal, and temporal fossae.