2nd constriction of esophagus is due to -: (A) Left principal bronchus, (B) Arch of arorta, (C) Pharyngoesophageal junction, (D) None
Answer is B. Ans. is 'b' i.e., Arch of arorta Esophageal constrictionsNumberDistance from incisorBony levelAnatomical landmark1st2nd3rd4th15 cm (6 inches)22-5 cm (9 inches)27-5 cm (11 inches)37 -5 -40 cm (15-16 inches)C6T4T6T10At its beginning (pharyngoesophageal junction)Crossing of aortic archCrossing of left main bronchusPiercing diaphragm (at lower esophageal sphinctor)