👉 The term "sinuses" is a medical term that refers to the openings in the nasal cavity of the human body. These are typically lined with hair or skin and are responsible for breathing, as well as allowing air into and out of the nose. The function of the sinuses is to filter out foreign matter such as dust and pollen from entering the nasal passages, which can cause irritation and allergies. The exact structure and function of a sinus gland varies between different species, but they all share a