<prompt> The narrowest pa of the larynx isVentricleVestibuleSubglottic spaceGlottis  <response>: The rima has an anterior intermembranous pa three-fifth and a posterior intercailaginous pa, The rima is the narrowest pa of the larynx. It is longer 23 mm in males than in females 17 mm . ref : B D Chaurasias Human Anatomy , sixth edition, volume 3 , pg. no. 256 ref : 16.15a , B D Chaurasias Human Anatomy , sixth edition, volume 3 , pg. no. 255 