This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Killian's dehisense is seen in: 
Select and explain. 
A. Oropharynx, B. Nasopharynx, C. Cricopharynx, D. Vocal cords
C: Cricopharynx
Answer: C: Cricopharynx 
Explanation: 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 5/e,p 253,6/e,p 238.