The relationship between the physiological position of the esophagus and the neck is as follows: 1. The relationship between the esophagus and the cervical vertebrae, the upper part of the esophagus connects to the pharynx starting from the cricoid cartilage and cricopharyngeal muscle, and is parallel to the lower edge of the 6th cervical vertebrae, and the lower part of the esophagus is parallel to the 11th thoracic vertebrae. 2. The esophagus is located in the front of the middle part of the neck, directly behind the trachea and in front of the spine, and is parallel to the trachea and cervical vertebrae, and cannot be touched on the surface of the body. The length of the esophagus in the neck varies according to the body type, age and gender of each person, for example, the esophagus is longer in adults, and the younger the age, the shorter the esophagus; it is about 2 cm longer in men than in women; it is 2-3 cm longer in long and thin people than in short and fat people.