<prompt> Killians dehiscence is inSuperior constrictorInferior constrictorMiddle constrictorNone  <response>: Inferior constrictor muscle has two parts. Thyropharyngeus with oblique fibres and cricopharyngeus with transverse fibres.Between these two parts exists a potential gap called Killians dehiscence. It is also called Gateway of tears. This is also the site of herniation of pharyngeal mucosa in case of the pharyngeal pouch. 