AAMI Anatomy 1 Practice Exam

Which bone is NOT part of the orbital cavity?

Frontal Tibia Zygomatic Maxilla

Correct Answer:

Tibia

Explanation:

The orbit is a bony socket formed by multiple skull bones that shape its roof, walls, and floor. The frontal bone helps form the roof, the maxilla contributes to the floor and medial wall, the zygomatic bone forms the lateral wall, and the sphenoid, ethmoid, lacrimal, and palatine bones contribute to other walls and margins. The tibia, however, is a long bone of the leg and has no role in constructing the skull or its orbital cavity. Because it does not participate in forming the orbit, it is not part of the orbital cavity.

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