<prompt> Killians dehisense is seen in:OropharynxNasopharynxCricopharynxVocal cords  <response>: It is the area of weakness between the two pas of inferior constrictor muscle-subthyropharyngeus and cricopharyngeus. Since it is an area of weakness it is one of the sites of esophageal perforation duting instrumentation and scopy-hence also called gateway of tears. It is lined by stratified squamous epithelium. Ref Dhingra 5e,p 253,6e,p 238. 