Surgery 3rd constriction of the oesophagus is at the level of? A Left brunchus crossing the aoa B Where it pierces the diaphragm C Junction of the oesophagus and stomach D Cricopharynx 💡 Explanation 3rd constriction of the oesophagus is at the level of? ✓ Correct Answer: B. Where it pierces the diaphragm