Which bone is referred to as the frontal bone and contains frontal sinuses?

The frontal bone is the correct answer because it is the bone located at the forehead region of the skull, forming the anterior part of the cranial cavity. This bone is significant not only for its role in protecting the brain but also for its involvement in the formation of the facial structure. One of its notable features is the presence of frontal sinuses, which are air-filled cavities located within the bone. These sinuses are part of the paranasal sinus system and contribute to various functions, including reducing the weight of the skull, providing resonance to the voice, and playing a role in the immune response by producing mucus.

The other choices do not pertain to the frontal bone. The vomer is a bone that forms part of the nasal septum but does not contain frontal sinuses. The mandible is the lower jawbone, primarily involved in chewing and articulation but has no relation to the frontal area or sinuses. The maxilla is the upper jawbone, which does support sinuses (the maxillary sinuses) but is distinct from the frontal bone. Thus, among all the options, the frontal bone is uniquely identified by its location and the presence of frontal sinuses.