Through which opening does the esophagus pass at the T8 vertebral level?

At the T8 vertebral level, the esophagus passes through the esophageal hiatus, which is a specific opening in the diaphragm. This is an important anatomical feature as it allows the esophagus to transition from the thoracic cavity to the abdominal cavity. The esophageal hiatus is crucial for the proper passage of food and liquids from the mouth to the stomach.

In contrast, the aortic hiatus, located at the T12 level, is specifically for the aorta and also the thoracic duct and is not involved with the esophagus. The opening for the inferior vena cava is found at the T8 level but is separate from the esophageal hiatus. The thoracic duct passes through the diaphragm at a different level as well. Since the question specifically asks about the passage of the esophagus, it is clear that the esophageal hiatus is the correct choice.