Killian's dehiscence (also known as Killian's triangle) is a triangular area in the wall of the pharynx between the cricopharyngeus and thyropharyngeus which are the two parts of the inferior constrictors(also see Pharyngeal pouch).
Killian's gap is a triangular space within the pharyngeal wall, situated between the cricopharyngeus and thyropharyngeus muscles, which are components of the inferior constrictor muscle. This area is also referred to as Killian's triangle or is associated with Pharyngeal pouch.