Which bone is located at the front inner wall of the orbits?

Which bone is located at the front inner wall of the orbits?

• A. Sphenoid bone
• B. Lacrimal bone
• C. Ethmoid bone
• D. Zygomatic bone

Answer: (B)

This item tests knowledge of the orbital bones, specifically which bone forms the front part of the inner (medial) wall of the orbit. The medial wall is made up of contributions from the lacrimal bone (at the anterior portion) and the ethmoid bone (more posteriorly). The lacrimal bone is a small, delicate bone located at the front of the medial wall, adjacent to the lacrimal fossa for the lacrimal sac, which is why it is described as being on the front inner wall of the orbits. The ethmoid contributes the posterior portion, the sphenoid is associated with the posterior orbit, and the zygomatic bone forms part of the lateral wall.

This item tests knowledge of the orbital bones, specifically which bone forms the front part of the inner (medial) wall of the orbit. The medial wall is made up of contributions from the lacrimal bone (at the anterior portion) and the ethmoid bone (more posteriorly). The lacrimal bone is a small, delicate bone located at the front of the medial wall, adjacent to the lacrimal fossa for the lacrimal sac, which is why it is described as being on the front inner wall of the orbits. The ethmoid contributes the posterior portion, the sphenoid is associated with the posterior orbit, and the zygomatic bone forms part of the lateral wall.