**Core Concept**
The superficial perineal pouch is a fascial space in the perineum that contains various structures, including muscles, nerves, and vessels. It is one of the two compartments of the perineum, the other being the deep perineal pouch. The superficial perineal pouch plays a crucial role in the innervation and blood supply of the genitalia.

**Why the Correct Answer is Right**
The superficial perineal pouch contains the ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles, which are involved in the erectile function of the penis and clitoris, as well as the bulbospongiosus muscle, which surrounds the bulb of the penis and the bulb of the vestibule in females. The pouch also contains the great vestibular glands (Bartholin's glands) in females, which secrete mucus to lubricate the vagina. The superficial perineal nerves, which include the dorsal nerve of the penis and clitoris, also pass through this pouch.

**Why Each Wrong Option is Incorrect**
**Option A:** The deep perineal pouch contains structures such as the urethral sphincter, the prostate gland, and the membranous part of the urethra, which are not present in the superficial perineal pouch.

**Option B:** The superficial perineal pouch does not contain the glans penis or the glans clitoris, which are covered by the prepuce and are located in the deeper perineal structures.

**Option C:** The superficial perineal pouch does not contain the rectum or the anal canal, which are located in the pelvic cavity and are not part of the perineum.

**Option D:** The superficial perineal pouch does not contain the obturator internus muscle, which is located in the pelvic cavity and is not part of the perineum.

**Clinical Pearl / High-Yield Fact**
The superficial perineal pouch is an important anatomical landmark in surgical procedures such as perineal surgery for rectal prolapse or fistula-in-ano repair, where the surgeon must carefully dissect the structures within this pouch to avoid damage to the surrounding nerves and vessels.

**Correct Answer: B. The superficial perineal pouch contains the ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles, the great vestibular glands in females, and the superficial perineal nerves.**