<prompt> Killian dehiscence is seen inSuperior constrictorInferior constrictorMiddle constrictorNone  <response>: Inferior constrictor muscle has two pas:- i Thyropharyngeous with oblique fibers, and ii Cricopharyngeous with transverse fibers Between these two pas of inferior constrictor exists a potential gap called Killian;s dehiscence. It is also called the gateway to tear as perforation can occur at this site during esophagoscopy. It is also the site for herniation of pharyngeal mucosa in case of the pharyngeal pouch. Ref: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 269 