The Probert Encyclopaedia of Medicine

SPHENOID BONE

The sphenoid bone is one of the cranial bones and spans the inside of the skull laterally. The sphenoid bone has four wings: two greater and two lesser. The greater wings form part of the sides of the skull, with one greater wing on each side and extending inward to form also part of the back surface of each orbital cavity. The two lesser wings form a small part of the back surfaces of the orbital cavities, and meet in the middle of the skull. The sphenoid bone features two paranasal cavities, or sinuses, called the sphenoids.
Research Sphenoid Bone