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• The hiatus of the inferior vena cava is located in the tendinous portion of the diaphragm at the level of the T8 vertebra.
• The esophagal hiatus is located in the muscular portion of the diaphragm at the level of the T10 vertebra.
• The aortic hiatus is located posterior to the median arcuate ligament of the diaphragm at the level of the T12 vertebra.

Links and References:
Grant's: 2.100
Netter: 181
Rohen/Yokochi: 314