Aoic hiatus contains
**Core Concept**
The aortic hiatus is an anatomical structure in the diaphragm that allows the passage of the aorta, along with other structures. It is located at the level of the twelfth thoracic vertebra. The **diaphragm** is a dome-shaped muscle that separates the chest cavity from the abdominal cavity.
**Why the Correct Answer is Right**
The aortic hiatus contains the **aorta**, along with the **thoracic duct** and **azygos vein**. The aorta passes through this hiatus to continue as the abdominal aorta in the abdominal cavity. The thoracic duct, which is the main lymphatic channel in the body, also passes through the aortic hiatus.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately represent the structures passing through the aortic hiatus.
**Option B:** This option is also incorrect as it does not include all the structures that pass through the aortic hiatus.
**Option C:** This option is incorrect because the aortic hiatus specifically contains the aorta, thoracic duct, and azygos vein.
**Clinical Pearl / High-Yield Fact**
The aortic hiatus is an important anatomical landmark, and its contents are crucial for various medical procedures and diagnoses. Remembering the structures that pass through the aortic hiatus can help in understanding various clinical conditions.
**Correct Answer:** D. aorta, thoracic duct and azygos vein.