Zenker's diverticulum is typically located above which anatomical structure?

Zenker's diverticulum is a pharyngeal diverticulum that forms just above the upper esophageal sphincter (UES) in the esophagus. This anatomical location is significant because the diverticulum arises due to increased pressure within the esophageal lumen, especially during swallowing, and occurs at a site of weakness in the muscular wall of the pharynx.

This diverticulum typically presents in older adults and can lead to symptoms such as dysphagia, regurgitation of undigested food, and bad breath due to food stagnation. Understanding its location above the UES helps in diagnosing potential complications associated with swallowing and esophageal function. The UES serves as a critical barrier between the pharynx and the esophagus, and disturbances in this area can significantly affect swallowing dynamics, leading to the formation of the diverticulum.