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The diaphragmatic apertures are a series of apertures that permit the passage of structures between the thoracic and abdominal cavities. There are three main apertures:
- aortic hiatus (T12) (not a true aperture)
- esophageal hiatus (T10)
- vena caval foramen (T8)
The vertebral levels of these apertures can be remembered by this mnemonic or by the number of letters in the spelling of vena cava (8), esophagus (10) and aortic hiatus (12).
There are also several smaller lesser apertures.