Constrictions of esophagus when measured from upper incisors are present at

At- 15 cm (6 inch) from incisor at cricophyrangeal junction behind the cricoid cailage () At 25 cm Broncho-aoic constriction(23+28[?]50/2[?]25cm) At 40 cm(15 inch) from incisor -esophageal hiatus where it passes through the diaphragm in the posterior mediastinum(T10) At 23 cm(9 inch) from incisor -due to crossing of arch of aoa in front in the superior mediastinum() At 28 cm (11 inch)from incisor -esophagus is compressed by the left main bronchus in the posterior mediastinum()