**Core Concept**
The deep perineal pouch is a fascial space in the **perineum** that contains several important structures. It is located between the inferior fascia of the **urogenital diaphragm** and the superior fascia of the urogenital diaphragm. The deep peroneal pouch plays a crucial role in the support and function of the **urinary** and **reproductive systems**.

**Why the Correct Answer is Right**
The correct answer is related to the structures that are actually found within the deep perineal pouch, including the **membranous urethra**, **external urethral sphincter**, and **deep transverse perineal muscles**. These structures are involved in the regulation of **urination** and support of the pelvic floor.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the contents of the deep perineal pouch.
**Option B:** Similarly, this option is also incorrect as it does not represent the structures found in the deep perineal pouch.
**Option D:** This option is incorrect because it is not related to the deep perineal pouch.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the deep perineal pouch contains structures that are critical for the support and function of the pelvic floor, particularly in females. The **deep perineal pouch** is also involved in the formation of the **urogenital diaphragm**.

**Correct Answer:** Correct Answer: B. External urethral sphincter, deep transverse perineal muscles, and membranous part of urethra.