Which of the following are considered the four main sinuses?

The four main sinuses are the frontal, maxillary, ethmoid, and sphenoid sinuses. These sinuses are air-filled spaces located within the bones of the skull that contribute to various functions such as reducing the weight of the skull, enhancing voice resonance, and providing a buffer against facial trauma.

The frontal sinuses are located in the forehead region, just above the eyes. The maxillary sinuses are the largest and are found in the cheek area. The ethmoidal sinuses consist of a collection of small air cells situated between the eyes, and the sphenoidal sinuses are located deeper in the skull, behind the eyes, and above the nasal cavity.

These specific sinuses are essential for proper respiratory function and play a role in mucus production and drainage. Other options list incorrect combinations of sinuses that do not typically encompass the four main sinuses recognized in human anatomy. For instance, nasal sinuses refer more to the nasal cavity rather than being classified as a sinus, and structures like the occipital and temporal regions do not include sinuses in the same context as the frontal, maxillary, ethmoid, and sphenoid. Thus, option B accurately identifies the correct group of main sinuses recognized in dental and anatomical