The caval opening transmits which major vessel?

The caval opening transmits which major vessel?

• A. Inferior Vena Cava
• B. Esophagus
• C. Aorta
• D. Thoracic Duct

Answer: (A)

The key idea is that the caval opening is the diaphragmatic passage for the inferior vena cava. This opening sits in the central tendon of the diaphragm at roughly the T8 level and allows the inferior vena cava to pass from the abdomen into the thorax, bringing blood back to the heart. It often also transmits the right phrenic nerve. Other major structures use different diaphragmatic openings: the esophagus goes through the esophageal hiatus, and the aorta (along with the thoracic duct) passes through the aortic hiatus. So, the major vessel transmitted by the caval opening is the inferior vena cava.

The key idea is that the caval opening is the diaphragmatic passage for the inferior vena cava. This opening sits in the central tendon of the diaphragm at roughly the T8 level and allows the inferior vena cava to pass from the abdomen into the thorax, bringing blood back to the heart. It often also transmits the right phrenic nerve. Other major structures use different diaphragmatic openings: the esophagus goes through the esophageal hiatus, and the aorta (along with the thoracic duct) passes through the aortic hiatus. So, the major vessel transmitted by the caval opening is the inferior vena cava.