**Core Concept**
The deep perineal pouch is a fascial compartment in the perineum that contains crucial structures necessary for urination and sexual function. It is a significant anatomical region that serves as a passageway for the urethra in males and females, and the urogenital diaphragm.

**Why the Correct Answer is Right**
The deep perineal pouch contains the urogenital diaphragm, which is composed of the external urethral sphincter, the superficial transverse perineal muscle, and the perineal body. The urogenital diaphragm plays a vital role in maintaining urinary continence by providing a muscular layer that supports the urethra and assists in its closure. The deep perineal pouch also contains the membranous part of the urethra in males, which is a short, narrow section that passes through the urogenital diaphragm.

**Why Each Wrong Option is Incorrect**
**Option A:** The superficial perineal pouch, not the deep perineal pouch, contains the ischiocavernosus and bulbospongiosus muscles.
**Option B:** The anal triangle, not the deep perineal pouch, contains the external anal sphincter and the anal glands.
**Option C:** The superficial perineal pouch, not the deep perineal pouch, contains the great vestibular glands in females.

**Clinical Pearl / High-Yield Fact**
The deep perineal pouch is a narrow, diamond-shaped space that is bounded by the inferior fascia of the urogenital diaphragm and the superior fascia of the perineal membrane. It is an essential region to understand for urologists, gynecologists, and obstetricians, as it plays a critical role in the management of urinary incontinence and pelvic floor disorders.

**Correct Answer:** C.