Anatomy of Pharynx
Killian's dehisence is seen in: (AIIMS Nov 2011)
a. it is an area of weakness between the two parts of inferior constrictor muscle-sub thyropharyngeus and cricopha-ryngeus
b. A pulsion diverticulum of pharyngeal mucosa can emerge posteriorly through the Killian's dehiscence called as Zenker's diverticulum or pharyngeal pouch.
c. Since it is an area of weakness it is one of the sites of esophageal perforation during instrumentation and scopy-hence also called 'Gateway of Tears:
Killian-Janieson's space - It lies between cricopharyngeus and circular fibres of the esophagus.
Lamier Hackemann's space - It lies between circular and longitudinal fibers I of esophagus.