Inferior thoracic aperture

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Inferior thoracic aperture
The thorax from behind.
Latin apertura thoracis inferior
Dorlands/Elsevier a_51/12144778

The inferior thoracic aperture is much larger than the superior thoracic aperture. It is closed by the diaphragm, which separates the thoracic and abdominal cavities.

The inferior thoracic aperture is bounded by:

Structures passing through the inferior thoracic aperture between the thorax and abdomen include the inferior vena cava and esophagus, both of which pass through the diaphragm, and the abdominal aorta and thoracic duct which pass posterior to the diaphragm through the aortic hiatus.