Sinus frontalis (frontal sinus)

The frontal sinus (Sinus frontalis) belongs like the maxillary sinus, sphenoidal sinus and the ethmoid cells to the paranasal sinuses (Sinus paranasales). It represents an air-filled cavity in the bone that forms the forehead and, like the other parts of the paranasal sinuses, it can also become inflamed, which is known as sinusitis (see below). … Sinus frontalis (frontal sinus)