Glabella is located directly above which landmark?

• A. Nasion
• B. Bregma
• C. Lambda
• D. Asterion

Answer: (A)

This question tests understanding of how the key midline skull landmarks align with each other. The glabella is the smooth, raised area of the frontal bone between the eyebrows. The nasion is the midline point where the frontal bone and nasal bones meet at the base of the nasal bridge. These two points sit on the same vertical line, so the glabella is directly above the nasion.

The other landmarks lie in different regions: the bregma is where the coronal and sagittal sutures intersect near the top of the skull, the lambda is where the sagittal and lambdoid sutures meet toward the back, and the asterion is a posterior point at the junction of several sutures behind the ear. They are not directly beneath the glabella, which is why nasion is the correct landmark.