<prompt> Answer this question truthfullyWhat is a false diverticulum that is caused by cricopharyngeal motor dysfunction and is an outpouching of pharyngeal mucosa through an acquired defect in the muscular wall?  <response>: <reason> Zenker diverticulum is a false diverticulum that is caused by cricopharyngeal motor dysfunction and is an outpouching of pharyngeal mucosa through an acquired defect in the muscular wall. 