**Question:** Trigone of urinary bladder develops from which part?

**Core Concept:**
The trigone of the urinary bladder is a triangular-shaped area within the bladder, located in the midline between the two ureters. It is formed from the mesentery-derived Mural (inner) and Epigastric (outer) layers of the Wolffian duct remnants during embryonic development.

**Why the Correct Answer is Right:**
The trigone is derived from the Mural (inner) and Epigastric (outer) layers of the mesentery-derived Wolffian duct remnants. These layers contribute to the formation of the muscular and serous membranes of the urinary bladder wall, respectively. In this context, the correct answer (C) refers to the correct developmental origin of the trigone, while options A, B, and D are incorrect.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because it does not refer to the correct developmental origin of the trigone from the Wolffian duct remnants.
B. This option is incorrect as it does not correspond to the correct developmental stage of the trigone formation from the mesentery-derived Wolffian duct remnants.
D. This option is incorrect as it does not align with the correct developmental process of the trigone being derived from the mesentery-derived Wolffian duct remnants.

**Clinical Pearl / High-Yield Fact:**
The trigone plays a crucial role in urine storage and helps maintain bladder pressure during the filling and voiding phases of the urinary cycle. Understanding its development and function is essential for medical students, residents, and practitioners to comprehend the normal urinary system anatomy and physiology.

**Correct Answer:** C. Mural and Epigastric layers of the mesentery-derived Wolffian duct remnants