How do the sinuses connect to the nasal cavity?

The correct answer is that the sinuses connect to the nasal cavity via ostia. Ostia are small openings that allow for the drainage and aeration of the sinuses. Each sinus has one or more ostia that connect it to the nasal cavity, facilitating the exchange of air and mucus. This connection is crucial for maintaining healthy sinus function, as it allows for ventilation, drainage of sinus secretions, and even helps to equalize pressure within the sinus cavities.

The presence of ostia means that sinus infections can result in blockage if they become swollen or inflamed, leading to a buildup of mucus. Understanding the role of ostia in sinus drainage provides insight into various sinus conditions and treatments, making it essential knowledge for studying the anatomy of the skull and sinuses.