Question

The anterior cranial fossa is formed by the

A) frontal bone.
B) frontal and temporal bones.
C) frontal, ethmoid, and sphenoid bones.
D) frontal, sphenoid, and temporal bones.

Answer 1

The anterior cranial fossa is formed by the frontal bone and also includes the lesser wings of the sphenoid bone and a portion of the ethmoid bone. It is the most anterior and shallowest of the three cranial fossae.

Step-by-step explanation:

The anterior cranial fossa is formed by the frontal bone. It is the most anterior and shallowest of the three cranial fossae. The frontal bone forms the majority of the floor for this space, while the lesser wings of the sphenoid bone mark the boundary between the anterior and middle cranial fossae. In addition, a portion of the ethmoid bone, including the crista galli and cribriform plates, is located in the midline of the anterior cranial fossa.