Esophagus 告n慧舌chooephalicous position and division three parts: Cervical parts:5cm; Thoracic parts:18-20 cm; Abdominal parts only 1-2cm 3 constrictions of the esophagus: narrows position distance from middle inscior first beginning 15cm second in front of left branchus 25cm third esophageal hiatus 40cm 7 （position and division 3 constrictions of the esophagus: narrows position distance from middle inscior first beginning 15cm second in front of left branchus 25cm third esophageal hiatus 40cm three parts: Cervical parts：5cm; Thoracic parts: 18-20 cm; Abdominal parts : only 1-2cm. : Esophagus