Where is the sphenoid bone located?

The sphenoid bone is indeed located behind the eyes and nose. It is a complex, butterfly-shaped bone situated at the midline of the skull. This positioning makes it a crucial part of the cranial structure, as it connects with several other bones in the skull, acting as a keystone. The sphenoid also helps form the base of the skull and the eye socket, providing support for the structures of the face. Its strategic location allows it to play a vital role in protecting the brain and facilitating the functions of the facial region.

Other options, while describing different regions of the skull, do not accurately pinpoint the sphenoid bone's location. The base of the skull and outer sides of the skull refer to regions associated with different bones, such as the occipital and temporal bones, while the upper jaw pertains to the maxilla, which is not related to the sphenoid.