**Question:** All of the following are contents of deep perineal pouch except

A. Sphincter ani
B. Rectum
C. External anal sphincter
D. Urethra

**Core Concept:**

The deep perineal pouch is a region within the perineum, which is the area between the anus and vulva in females or between the anus and scrotum in males. It contains various structures that are essential for maintaining urinary, anal, and sexual functions. The contents of the deep perineal pouch are:

1. **Sphincter ani:** The external anal sphincter is a circular muscle layer that surrounds the anus and helps in controlling the passage of fecal matter and urine.
2. **Rectum:** The rectum is a part of the gastrointestinal tract responsible for storing fecal matter before it is expelled from the body.
3. **External anal sphincter:** This is a circular muscle layer surrounding the anus, which plays a crucial role in controlling the passage of fecal matter and urine.
4. **Dorsal raphe:** The dorsal raphe is a group of nerves in the perineum that plays a role in erectile function and sensation in males.

**Why the Correct Answer is Right:**

The deep perineal pouch contains several essential structures, primarily related to urinary, anal, and sexual functions. The correct answer (D) is excluded because it belongs to the area surrounding the deep perineal pouch rather than its contents.

**Why Each Wrong Option is Incorrect:**

A. **Sphincter ani:** This option is incorrect because the sphincter ani is a part of the deep perineal pouch and plays a crucial role in controlling the passage of fecal matter and urine.

B. **Rectum:** The rectum is a part of the gastrointestinal tract and is not a component of the deep perineal pouch. It is responsible for storing fecal matter before expulsion.

C. **External anal sphincter:** Similar to option A, the external anal sphincter is a part of the deep perineal pouch and plays a significant role in controlling the passage of fecal matter and urine.

D. **Dorsal raphe:** The dorsal raphe is a group of nerves in the perineum and is involved in erectile function and sensation in males. It is not a component of the deep perineal pouch.

**Clinical Pearl:**

The deep perineal pouch and its contents are essential for maintaining proper urinary, anal, and sexual functions. Understanding the anatomy and physiology of these structures is crucial for treating various genitourinary and anal conditions effectively.