Structure passing through the opening marked 3 in the diaphragm is
Caval opening T8- The caval opening passes through the central tendon of the diaphragm. It contains the inferior vena cava and the right phrenic nerve. Ref anatomy B. D. Chourasia thorax p54
Oesophagus
Left gastric nerve
Right phrenic nerve
Hemiazygos vein
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