Skull Base
Internal Features of Base of Skull
Divided into anterior, middle, and posterior cranial fossae
Anterior cranial fossa
- Contains frontal lobe of brain
- Formed by frontal bone anteriorly, ethmoid bone medially, and lesser wing of sphenoid bone posteriorly
Features
- Frontal crest—midline bony extension of frontal bone
- Foramen cecum—foramen at base of frontal crest
- Crista galli—midline ridge of bone from ethmoid posterior to foramen cecum
- Cribriform plate—thin, sievelike plate of bone on either side of crista galli, which transmits olfactory