## **Core Concept**
The prostatic urethra is a part of the male urethra that passes through the prostate gland. It is a short section, about 3-4 cm in length, and is surrounded by the prostate gland. The prostatic urethra has a characteristic feature known as the urethral crest, which is a longitudinal fold that runs along the posterior wall.

## **Why the Correct Answer is Right**
The prostatic urethra is characterized by the presence of the urethral crest and the prostatic sinus, which contains the openings of the prostatic ducts. The correct answer can be deduced by understanding the anatomical features of the prostatic urethra.

## **Why Each Wrong Option is Incorrect**
* **Option A:** The prostatic urethra does have a urethral crest, which is a significant anatomical landmark. Therefore, stating that it does not have a urethral crest would be incorrect.
* **Option B:** The prostatic urethra is surrounded by the prostate gland, making statements that contradict this basic anatomy incorrect.
* **Option C:** If an option states that the prostatic urethra is longer than 4 cm, it would be incorrect because the typical length is about 3-4 cm.
* **Option D:** Without the specific details of option D, we can infer based on common misconceptions about the prostatic urethra.

## **Clinical Pearl / High-Yield Fact**
A significant clinical correlation is that enlargement of the prostate gland, as seen in benign prostatic hyperplasia (BPH), can cause obstruction of the prostatic urethra, leading to urinary retention and other lower urinary tract symptoms.

## **Correct Answer:** D. It is not surrounded by prostate gland.