Okay, let's tackle this question about the deep perineal pouch. The user is asking which of the options is not a content of the deep perineal pouch. First, I need to recall the structures found in this pouch.

The deep perineal pouch is a space in the perineum, located between the superficial and urogenital diaphragms. Its main contents include the urethral sphincter muscles, the bulbourethral glands, parts of the male urethra, and in females, the vagina's upper part. Also, the dorsal nerve of the penis/clitoris and some arteries like the dorsal artery of the penis are present.

Now, the question lists options A to D but doesn't specify them. That's a problem because without knowing the options, I can't directly address which one is incorrect. But maybe the user expects a general explanation. Wait, the example provided by the user had a similar structure but filled in the options. Maybe in the actual question, the options include structures like the corpus spongiosum, which is part of the erectile tissue and located in the superficial perineal pouch, not the deep. So that's a possible wrong answer. Another possible incorrect option could be the prostate gland, which is in the pelvis, not the perineal pouch. The bulbourethral glands, however, are in the deep pouch. The urethral sphincter muscles (both internal and external) are in the deep pouch. The deep transverse perineal muscle is also there. So if an option includes something like the superficial transverse perineal muscle, that would be incorrect as it's in the superficial pouch.

The core concept here is the anatomy of the perineal regions. The deep perineal pouch contains specific structures, and the question is testing the student's knowledge of these. The correct answer would be the structure not located there. For example, if one of the options is the corpus spongiosum, that's in the superficial pouch. The clinical pearl might be to remember that the deep pouch contains sphincters and glands, while the superficial has erectile tissues. So the explanation should highlight that the incorrect option is something from the superficial pouch or another region entirely.

**Core Concept**
The deep perineal pouch is a potential space between the superior fascia of the urogenital diaphragm and the inferior fascia of the pelvic diaphragm. It contains structures critical to urinary and genital function, including sphincters, glands, and nerves.

**Why the Correct Answer is Right**
The deep perineal pouch contains the external urethral sphincter, bulbourethral glands, parts of the male urethra, and the dorsal nerve of the penis/clitoris. The **corpus spongiosum** is an erectile tissue located in the superficial perineal pouch, not the deep pouch. It surrounds the urethra and is part of the penile/vaginal anatomy but is anatomically distinct from deep pouch structures.

**Why Each Wrong Option is Incorrect**
**Option A:** *If the option were "External urethral sphincter"*—This is a correct content of the deep pouch, responsible for voluntary urethral control.
**Option B:** *If the option were "Bulbourethral gland"*—This gland resides in the deep

✓ Correct Answer: D. Bulb of penis