Sphenoid bone The sphenoid bone is situated in the center of the skull base and has direct contact with almost all other skull bones (except for nasal, lacrimal bone and mandible). It acts like the cornerstone transmitting and distributing the stress forces applied to the skull ". The sphenoid bone, often called the "keystone" of the cranial floor, is one of the most complex bones in the human skull. Located centrally at the base of the skull, it articulates with all other cranial bones and houses critical neurovascular structures. Parts of sphenoid bone Body of sphenoid The body of the sphenoid bone is the midline cubical portion of the sphenoid bone , hollowed by the sphenoid air sinuses. The body has superior, inferior, anterior, posterior, and lateral surfaces. The superior surface features: ethmoidal spine: prominent spine that articulates with the cribriform plate and grooved on either side by olfactory lobes of brain chiasmatic groove (a.k.a. optic groove): optic chiasm lies above and behind optic canal ...
