<prompt> Esophagus Pierces the diaphragm at the level ofT 6 veebraeT 8veebraeT 10 veebraeNone of the above  <response>: Esophagus It is a fibromuscular tube, about 25 cm long in an adult. It extends from the lower end of pharynx C6 to the cardiac end of stomach T11. It shows three normal constrictions and it is impoant to know their location at oesophagoscopy. They are: 1. At pharyngo-oesophageal junction C6--15 cm from the upper incisors. 2. At crossing of arch of aoa and left main bronchus T4--25 cm from upper incisors. 3. Where it pierces the diaphragm T10--40 cm from upper incisors. Ref:- Dhingra; pg num:-340 