<prompt> Nasal valve is formed by all except:SeptumMiddle turbinateLower end of upper lateral cailageInferior turbinate  <response>: Anterior nasal valve it is the narrowest pa of nose and is less well defined physiologically than anatomically. It is formed by the lower edge of the upper lateral cailages, the anterior end of the inferior turbinate and the adjacent septum. Ref. Dhingra 5e, p 150. 