Answer to Question 4:

The greater wing of the sphenoid bone forms a portion of all the following structures except:

a. The floor of the middle cranial fossa

b. The coronal suture

c. The lateral skull surface

d. Posterior wall of the orbit

The coronal suture is the junction of the frontal bone and the parietal bones.

The image on the left shows the greater wing of the sphenoid forming the medial portion of the floor of the middle cranial fossa. The next image shows the greater wing of the sphenoid forming portions of the lateral skull convexity and the posterior wall of the orbit.