Killian's dehiscence is seen in

Killian's dehiscence (also known as Killian's triangle, Laimer's triangle, and Killian-Laimer triangle) is a triangular area in the wall of the pharynx between the thyropharyngeus pa of the inferior constrictor of the pharynx and the cricopharyngeus muscle, also of the inferior constrictor muscle of the pharynx. It represents a potentially weak spot where a pharyngoesophageal diveiculum (Zenker's diveiculum) is more likely to occur