What is number 2?

Question

What is number 2?

BlackTom AI · Accepted Answer

In this axial brain CT slice, each numbered label corresponds to a specific anatomical structure around the orbit.
Option 1: orbit. Saying 'orbit' would be too general here; the question is asking for a specific component of the orbit, not the entire bony socket itself.
Option 2: roof of orbit. The label 2 is pointing to the bony area forming the superior boundary of the eye socket, i.e., the orbital roof. This is consistent with the anatomical location just above the globe and below the frontal bone, making it the correct identification here.
Option 3: frontal sinus. The frontal sinus is located superior to the orbits within the frontal bone and would appear as a sinus cavity above the orbital roof, not as the structure labeled at position 2 in this image.
Option 4: ethmoid sinus. The ethmoid air cells lie between the nose and the orbits, medially to the orbital walls, and would not correspond to the label 2 on this axial view of the orbits.
Thus, the label 2 corresponds to the roof of the orbit, while the other options refer to adjacent but distinct structures that do not match the labeled position.

What is number 2?

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