Ethmoid bone from above.

Ethmoid Bone from Above

Ethmoid bone from above.

Ethmoid bone from behind.

Ethmoid Bone from Behind

Ethmoid bone from behind.

The outer surface of the ethmoid bone.

Outer Surface of Ethmoid Bone

The outer surface of the ethmoid bone.

Perpendicular plate of ethmoid, shown by removing the right lateral mass.

Perpendicular Plate of Ethmoid

Perpendicular plate of ethmoid, shown by removing the right lateral mass.