<prompt> Most commonly foreign body lodges in which pa of esophagusAt the level of cricopharyngeusWhere it crosses the aoic archWhere it is crossed by left bronchusWhere it pierces the diaphragm  <response>: There are physiological constrictions in esophagus at 4 levels as mentioned below, foreign body MC lodges at first constriction. Constriction of oesophagus Veebral Level Distance From Upper Incisors Cricopharyngeal C6 6 Arch of aoa T4 9 Crossing of left bronchus T6 11 Esophageal opening in diaphragm T10 15 