Aortic hiatus Totally Explained

Everything about The Aortic Hiatus totally explained

The aortic hiatus is a hole in the human diaphragm. It is the lowest and most posterior of the large apertures.
It is located approximately at the level of the twelfth thoracic vertebra (T12).

Structure

Strictly speaking, it isn't an aperture in the diaphragm but an osseoaponeurotic opening between it and the vertebral column, and therefore behind the diaphragm; occasionally some tendinous fibers prolonged across the bodies of the vertebræ from the medial parts of the lower ends of the crura pass behind the aorta, and thus convert the hiatus into a fibrous ring.
The hiatus is situated slightly to the left of the middle line, and is bounded in front by the crura, and behind by the body of the first lumbar vertebra.

Structures passing through

Through it pass the aorta, the azygos vein, and the thoracic duct; occasionally the azygos vein is transmitted through the right crus.
Other sources state that the Aorta doesn't pass through the aortic hiatus, rather, it passes posterior to it. According to this definition, only the azygos vein and thoracic duct pass through this opening.

Additional images

Image:Gray599.png|The thoracic and right lymphatic ducts. Further Information

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