National Dental Assisting Examining Board (NDAEB) Practice Exam

Which bones contribute to the orbit at the inner angle of the eye?

1. Frontal

2. Lacrimal

3. Maxilla

4. Zygomatic

The correct answer is: Lacrimal

The lacrimal bone plays a crucial role in forming the orbit at the inner angle of the eye. This small and fragile bone is situated at the front part of the medial wall of the orbit, contributing to the structure that houses the lacrimal sac, which is essential for tear drainage. Its location is significant as it integrates with other bones within the orbit, but its primary importance lies in its direct contribution to the inner corner, or medial aspect, of the orbit. While other bones mentioned are also part of the orbital structure, they do not specifically contribute to the inner angle. The frontal bone forms the forehead and the roof of the orbit, while the maxilla, often recognized as the upper jawbone, contributes to the orbital floor and the lateral part of the inner angle. The zygomatic bone, known for forming the cheekbone, primarily influences the lateral aspects of the orbit. In summary, the lacrimal bone uniquely defines the inner angle of the eye, making it the most accurate answer in this context.