What is the name of the wedge-shaped bone that joins all the bones of the cranium?

The wedge-shaped bone that connects all the bones of the cranium is known as the sphenoid bone. This bone plays a crucial role in the structure of the skull, serving as a central keystone that holds together various cranial bones. Its unique shape allows it to articulate with multiple other bones, including the frontal, temporal, parietal, and occipital bones. The sphenoid also contributes to the formation of the base of the cranium and the orbits of the eyes. This anatomical feature is essential for providing stability to the skull and supporting the overall structure of the head.

Other options do not fulfill this specific anatomical function. For example, the maxilla is primarily involved in forming the upper jaw and parts of the orbits, while the zygomatic bone contributes to the cheek area. The nasal bones create the bridge of the nose. None of these bones serve the central connecting role that the sphenoid bone does in the cranium.