Aortic hiatus
The aortic hiatus is a midline: 185 opening in the posterior part of the diaphragm giving passage to the descending aorta as well as the thoracic duct, and variably the azygos and hemiazygos veins. It is the lowest and most posterior of the large apertures.
| Aortic hiatus | |
|---|---|
The diaphragm. Under surface. (Aortic hiatus labeled near center.) | |
Celiac and cranial mesenteric ganglion in a cat. 1 Crus sinistrum (Diaphragma), 2 hiatus aorticus, 3 Aorta, 4 Arteria lumbalis, 5 Nervus splanchnicus major, 6 Arteria coeliaca, 7 Arteria phrenica caudalis, 8 Ganglion coeliacum, 9 Plexus coeliacus, 10 Ganglion mesentericum craniale, 11 Plexus mesentericus cranialis, 12 Arteria mesenterica cranialis, 13 Nervus splanchnicus minor, 14 Adrenal gland, 15 Arteria abdominalis cranialis, 16 Stomach, 17 Liver (Lobus caudatus), 18 Kidney | |
| Details | |
| Identifiers | |
| Latin | hiatus aorticus |
| TA98 | A04.4.02.010 |
| TA2 | 2342 |
| FMA | 58288 |
| Anatomical terminology | |
It is located at the level of the inferior border of the twelfth thoracic vertebra (T12), posterior to the median arcuate ligament: 185 between the two crura of the diaphragm.
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