<prompt> Which of the following is known as Gateway of tears?Killians dehiscenceRathkes pouchWaldeyers ringSinus of Morgagni  <response>: Inferior constrictor muscle has two pas: Thryopharygeus with oblique fibres Cricopharyngeus with transverse fibres Between these two pas exists a potential gap called Killian;s Dehiscence also called Gateway of tears - As perforation can occur at this site during esophagectomy. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 310 