The Frontal Bone, the Ethmoid, and the Lesser Wings of the Sphenoid

Question

The frontal bone, the ethmoid, and the lesser wings of the sphenoid form the ________.
A) posterior cranial fossa
B) internal nares
C) anterior cranial fossa
D) middle cranial fossa
E) crista galli

Accepted Answer

The frontal bone forms the anterior part of the cranium and the forehead, while the ethmoid bone forms the roof of the nasal cavity and the upper part of the nasal septum. The lesser wings of the sphenoid bone form part of the anterior cranial fossa, which houses the frontal lobes of the brain. Therefore, the frontal bone, the ethmoid, and the lesser wings of the sphenoid bone together form the anterior cranial fossa.