“Corps ronds and corps grains” are seen in:
**Core Concept**
The terms "corps ronds" and "corps grains" refer to specific histological structures seen in the **ovary**, particularly in the context of **ovarian follicles**. These terms are associated with the **luteinization** process and the formation of the **corpus luteum**.
**Why the Correct Answer is Right**
"Corps ronds" and "corps grains" are related to the **luteinization** of follicular cells after ovulation, leading to the formation of the **corpus luteum**. This process involves the transformation of **granulosa cells** into **luteal cells**, which then produce **progesterone**. The correct answer relates to the **ovary**, where these structures are found.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not relate to the ovarian structures in question.
**Option B:** Similarly, this option is incorrect as it does not pertain to the histological features of the ovary.
**Option C:** This choice is also incorrect for the same reason, lacking relevance to the ovarian corpus luteum.
**Clinical Pearl / High-Yield Fact**
Remember that the **corpus luteum** plays a crucial role in **pregnancy** by producing **progesterone**, which supports implantation of the embryo and early pregnancy until the **placenta** takes over this function.
**Correct Answer:** D. Ovary.