Reinke’s crystals are found in –
**Core Concept**
Reinke's crystals are microscopic, needle-like structures composed of hyaluronic acid and proteinaceous material, found in the interstitial tissue of the ovary. They are a characteristic feature of the corpus luteum, which forms after ovulation.
**Why the Correct Answer is Right**
Reinke's crystals are produced by the luteinizing cells of the corpus luteum and contribute to its characteristic appearance under microscopic examination. The presence of these crystals helps in differentiating the corpus luteum from other ovarian structures. The corpus luteum plays a crucial role in the menstrual cycle, producing progesterone to prepare the uterus for a potential pregnancy.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because Reinke's crystals are not found in the follicular fluid of the Graafian follicle.
**Option B:** Incorrect because Reinke's crystals are not a characteristic feature of theca cells in the ovarian stroma.
**Option C:** Incorrect because Reinke's crystals are not typically associated with the surface epithelium of the ovary.
**Clinical Pearl / High-Yield Fact**
The presence of Reinke's crystals in the corpus luteum is an important histopathological feature that helps in the diagnosis of ovarian pathologies, such as luteinized unruptured follicle syndrome.
**Correct Answer: C. The corpus luteum.**