The document summarizes the anatomy and physiology of the oesophagus. It notes that the oesophagus is approximately 25 cm long, extending from the lower end of the pharynx to the stomach. It describes the three normal constriction points where foreign bodies commonly become lodged. The wall of the oesophagus consists of four layers - mucosa, submucosa, muscular layer, and fibrous layer. Parasympathetic fibers from the vagus nerve and sympathetic fibers from the sympathetic trunk supply the oesophagus. Lymphatic drainage occurs to the deep cervical, posterior mediastinal and gastric nodes. Peristaltic movements propel food through the oesophagus and into