**Question:** All the following structures pass through Foramen Ovale except

A. Superior Vena Cava
B. Right Atrium
C. Inferior Vena Cava
D. Right Ventricle

**Core Concept:**
Foramen Ovale (FO) is a small opening in the wall (septum) between the right and left atria of the heart in humans during fetal development and in newborns. It closes shortly after birth as the right ventricle shrinks and the left ventricle grows. The structures that pass through this opening include the superior and inferior vena cava, which are veins that carry deoxygenated blood from the body to the heart, and the right atrium, which receives blood from these veins before it is pumped to the right ventricle and then to the lungs for oxygenation. The right ventricle is responsible for pumping oxygenated blood to the rest of the body.

**Why the Correct Answer is Right:**
The correct answer (D) is the right ventricle because it does not pass through the Foramen Ovale after birth. In contrast, all other options (A, B, and C) involve veins (superior and inferior vena cava) and the right atrium, which are involved in the circulation of deoxygenated blood, while the right ventricle is responsible for pumping oxygenated blood to the rest of the body.

**Why Each Wrong Option is Incorrect:**
A. Superior Vena Cava (Option A): This option is incorrect because the superior vena cava is a vein carrying deoxygenated blood to the right atrium, bypassing the foramen ovale in adults.
B. Right Atrium (Option B): Although the right atrium is involved in the circulation of deoxygenated blood, it does pass through the Foramen Ovale. Therefore, this answer is incorrect.
C. Inferior Vena Cava (Option C): Similar to Option A, the inferior vena cava carries deoxygenated blood to the right atrium, bypassing the foramen ovale in adults.

**Clinical Pearls:**
1. Understanding the normal developmental process of the heart and the closure of the foramen ovale is crucial for understanding cardiovascular anatomy and physiology.
2. The right ventricle is essential in pumping oxygenated blood to the systemic circulation, while the atria and veins carry deoxygenated blood to the ventricles.
3. The closure of the foramen ovale is a key event in the transition from fetal to postnatal circulation, helping to prevent mixing of oxygenated and deoxygenated blood.