Diaphragm apertures: spinal levels

Aortic hiatus = 12 letters = T12

Oesophagus = 10 letters = T10

Vena cava = 8 letters = T8

Diaphragm apertures

“3 holes, each with 3 things going through it”:
Aortic hiatus: aorta, thoracic duct, azygous vein.
Esophageal hiatus: esophagus, vagal trunks, left gastric vessels.
Caval foramen: inferior vena cava, right phrenic nerve, lymph nodes