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A thin, muscular wall (oval depression) ...

A thin, muscular wall (oval depression) in the heart is seen

A

Inter-atrial septum

B

Inter-ventricular septum

C

Right auriculo-ventricular septum

D

Left auriculo-ventricular septum

Text Solution

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The correct Answer is:
To solve the question regarding the thin muscular wall (oval depression) in the heart, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about a thin muscular wall that is described as an oval depression in the heart. 2. **Identifying the Structure**: In adult hearts, this oval depression is known as the **fossa ovalis**. It is a remnant of the foramen ovale, which is an opening that exists in the fetal heart. 3. **Locating the Fossa Ovalis**: The fossa ovalis is located in the **inter-atrial septum**, which is the wall that separates the right and left atria of the heart. 4. **Evaluating the Options**: - **Option A: Inter-atrial septum** - This is the correct answer since the fossa ovalis is indeed found here. - **Option B: Interventricular septum** - This is incorrect as it separates the right and left ventricles. - **Option C: Right auricular ventricular septum** - This is also incorrect as it separates the right atrium and right ventricle. - **Option D: Left auricular ventricular septum** - This is incorrect as well since it separates the left atrium and left ventricle. 5. **Conclusion**: Based on the evaluation of the options, the correct answer is **Option A: Inter-atrial septum**, where the fossa ovalis is located. ### Final Answer: The thin muscular wall (oval depression) in the heart is seen in the **inter-atrial septum**. ---
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