Which opening is located at the level of T8?

Which opening is located at the level of T8?

• A. Caval Opening
• B. Esophageal Opening
• C. Aortic Opening
• D. Phrenic Portal

Answer: (A)

The major openings in the diaphragm sit at predictable vertebral levels and correspond to the structures passing through them. This is often remembered with the 8-10-12 rule: the caval opening is at T8, the esophageal hiatus at T10, and the aortic hiatus at T12. The structure that passes through the caval opening is the inferior vena cava as it moves from the thorax into the abdomen through the central tendon. That makes the opening at T8 the caval opening. The esophageal hiatus at T10 carries the esophagus (and vagal trunks), and the aortic hiatus at T12 carries the aorta (and sometimes the thoracic duct). There isn’t a named “phrenic portal” opening in standard anatomy.

The major openings in the diaphragm sit at predictable vertebral levels and correspond to the structures passing through them. This is often remembered with the 8-10-12 rule: the caval opening is at T8, the esophageal hiatus at T10, and the aortic hiatus at T12. The structure that passes through the caval opening is the inferior vena cava as it moves from the thorax into the abdomen through the central tendon. That makes the opening at T8 the caval opening. The esophageal hiatus at T10 carries the esophagus (and vagal trunks), and the aortic hiatus at T12 carries the aorta (and sometimes the thoracic duct). There isn’t a named “phrenic portal” opening in standard anatomy.