What is the difference between the internal and external nasal valves?

Question

It seems the terms internal and external valve are often used differently by different surgeons, some will describe the external valve as the outer rim of the nostril while others describe it as the point where the lower lateral cartilage meets the upper lateral, others would describe this junction as the INTERNAL valve. Is there a correct definition or is it ambiguous and more dependent on individual anatomy?

Scott Shadfar, MD · Answer

Hello Noriko, Thank you for your very specific question. The external valve is easiest to define as the nostril margin where air meets the nose and its position relative to the septum.  External nasal valve collapse is often dynamic, meaning when you breathe in there is collapse of the nostril.The internal nasal valve is further in the nose, with the boundaries consisting of the lateral nasal sidewall or caudal(bottom) end of the upper lateral cartilage, the nasal septum and the head of the inferior turbinate. This roughly corresponds to the junction of the upper and lower lateral cartilages dependent on the patient.  Again assessing dynamic versus statis obstruction can make a difference. I would seek out care from a facial plastic surgeon who can more readily help you identify where your level of obstruction may be. I am happy to help.Dr. S

Robert S. Schmidt, MD · Answer

Thanks for your question. The external nasal valve is the external most part of your nostril. The internal nasal valve is defined as the area bordered by the septum, the inferior aspect of the upper lateral cartilage, and the head of the inferior turbinate. Basically, it's where your finger would stop if you were to pick your nose (not that anyone would ever do that!). The internal nasal valve is considered one of the most important places for breathing, as it's the narrowest part of the nasal airway.

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