## **Core Concept**
The Sinus of Morgagni, also known as the foramen of Morgagni, is an anatomical space in the diaphragm. It is a potential gap or hiatus located anteriorly between the sternocostal triangle (diaphragmatic origin of the transversus abdominis muscle) and the costal margin. Structures that pass through this sinus include the internal thoracic vessels (or their branches), lymphatic vessels, and sometimes parts of the liver.

## **Why the Correct Answer is Right**
The correct answer involves identifying which of the listed structures does not pass through the Sinus of Morgagni. Typically, the internal thoracic vessels (or their branches) and lymphatics are known to pass through this space. The sternocostal triangle itself is part of the diaphragm's origin and is related to the sinus but does not pass through it.

## **Why Each Wrong Option is Incorrect**
- **Option A:** If a structure like the internal thoracic vessels or their branches pass through the sinus, then option A would be incorrect because it indeed goes through the Sinus of Morgagni.
- **Option B:** Similarly, if another structure that typically passes through the sinus is listed, it would be incorrect for the same reason.
- **Option D:** Likewise, if another structure known to pass through the sinus is listed, it would not be the correct answer.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that hernias through the Sinus of Morgagni can occur, particularly in children, and may involve the liver (hence the term "Morgagni's hernia"). These hernias are usually congenital and can be a cause of respiratory distress.

## **Correct Answer:** D. Sternocostal triangle.