Mechanics
发表于 2025-3-28 17:12:17
The Esophagus and Esophagogastric Junction,scle (upper esophageal sphincter) at the level of the sixth cervical vertebra to a point 2 cm below the diaphragm, where it joins the stomach. In the thorax, the esophagus is a vertical, tubular, posterior, mediastinal structure ensheathed by an inner layer of circular muscle and an outer layer of l