Which of the following bones cannot be elevated or depressed?

The maxilla cannot be elevated or depressed in isolation during normal movement because it is a fixed bone that forms the upper jaw and part of the orbits of the eyes. Unlike the mandible, which is the only movable bone of the skull and can be raised (elevated) or lowered (depressed) during activities like chewing and speaking, the maxilla provides a stable foundation for the teeth and serves as an anchor for the surrounding structures.

The hyoid and clavicle, while not as commonly discussed, also have some mobility. The hyoid bone is suspended in the neck and can move slightly during swallowing and speaking, and the clavicle can be raised or lowered with the shoulder girdle.

Thus, the maxilla’s role as a non-movable structure in relation to the craniofacial skeleton distinguishes it as the answer to this question.