Three physiological strictures of the esophagus

The three physiological strictures of the esophagus are located at the beginning of the esophagus, at the intersection with the left main bronchus, and at the esophageal hiatus.

1. The beginning of the esophagus is

generally located at the lower edge of the 6th cervical vertebral body, about 15 cm away from the central incisor, which is caused by the compression of surrounding tissues.

2. The intersection with the left main bronchus is

located at the horizontal line between the 4th thoracic vertebra and the 5th thoracic vertebra, about 25 cm away from the central incisor, which is caused by the compression of the left main bronchus, resulting in local stricture.

3. The esophageal hiatus is

generally parallel to the 10th diaphragm, about 40 cm away from the central incisor. The esophagus passes through the thoracic vertebra from this, resulting in a narrow lumen here.