What is the name of the junction between the nasal vestibule and the main nasal cavity?

The junction between the nasal vestibule and the main nasal cavity is known as the nasal valve. This area plays a crucial role in regulating airflow through the nasal passages and is located at the narrowest part of the nasal airway. It helps maintain appropriate resistance to airflow and contributes to various respiratory functions, including olfaction and humidification of inhaled air.

Understanding the significance of the nasal valve can provide insight into conditions that might affect nasal airflow or contribute to nasal obstruction. Other structures mentioned, like the nasal concha, are involved in the filtration and humidification of air but are not the specific junction referred to in the question. The nasal septum is the structure that divides the nasal cavity into two nostrils, while the term "nasal passage" is a more general term that could refer to any part of the nasal cavity. Thus, recognizing the distinct role of the nasal valve is essential in understanding nasal anatomy and function.