Which bone is NOT part of the orbit?

Which bone is NOT part of the orbit?

• A. Maxilla
• B. Frontal
• C. Mandible
• D. Sphenoid

Answer: (C)

The orbit is a bony cavity formed by several skull bones that create its roof, walls, and floor. The frontal bone contributes to the roof, the sphenoid helps form the posterior and part of the walls, and the maxilla (along with contributions from ethmoid, lacrimal, and others) lines the floor and medial wall. The mandible, on the other hand, is the lower jaw and does not participate in forming the orbital boundaries or housing the eye. That’s why the mandible is not part of the orbit.

The orbit is a bony cavity formed by several skull bones that create its roof, walls, and floor. The frontal bone contributes to the roof, the sphenoid helps form the posterior and part of the walls, and the maxilla (along with contributions from ethmoid, lacrimal, and others) lines the floor and medial wall. The mandible, on the other hand, is the lower jaw and does not participate in forming the orbital boundaries or housing the eye. That’s why the mandible is not part of the orbit.