What forms the lateral boundary of the orbit?

What forms the lateral boundary of the orbit?

• A. Greater wing of sphenoid and frontal process of zygomatic bone
• B. Superior orbital fissure
• C. Ethmoid bone
• D. Inferior orbital fissure

Answer: (A)

Understanding the boundaries of the orbit, especially the lateral wall, helps identify what forms its edge. The lateral boundary is created by the frontal process of the zygomatic bone together with the greater wing of the sphenoid—the zygomatic bone provides the anterior portion near the orbital rim, while the greater wing of the sphenoid contributes to the posterior part of the lateral wall. The superior orbital fissure sits at the top edge as a gap between bones, not the lateral boundary; the ethmoid bone forms the medial wall; and the inferior orbital fissure runs along the lower part, not the lateral edge.

Understanding the boundaries of the orbit, especially the lateral wall, helps identify what forms its edge. The lateral boundary is created by the frontal process of the zygomatic bone together with the greater wing of the sphenoid—the zygomatic bone provides the anterior portion near the orbital rim, while the greater wing of the sphenoid contributes to the posterior part of the lateral wall. The superior orbital fissure sits at the top edge as a gap between bones, not the lateral boundary; the ethmoid bone forms the medial wall; and the inferior orbital fissure runs along the lower part, not the lateral edge.