The maxillary sinus drains into which part of the nasal cavity?

The maxillary sinus drains into the middle meatus of the nasal cavity. This drainage occurs through the maxillary ostium, which is located in the anterior part of the middle meatus. The middle meatus is a critical area where several other sinuses also drain, including the frontal and anterior ethmoidal sinuses, making it an important site for sinus health and function.

Understanding the anatomy of the nasal cavity and the positions of the meatuses is essential in grasping how sinus drainage works. The maxillary sinus's drainage into the middle meatus is significant because it can impact conditions such as sinusitis, where blockages can lead to fluid accumulation and infection. Proper drainage through the middle meatus ensures that mucous from the sinus is cleared into the nasal cavity, facilitating normal respiratory function and maintaining sinus health.