Okay, let's tackle this question. The patient has an injured perineum, can't pass urine despite the urge, and there's blood at the meatus with swelling in the penis and scrotum. Hmm.

First, I need to recall the anatomy of the male urinary tract. The urethra has two parts: the posterior and anterior. The posterior includes the prostatic and membranous parts, while the anterior is the bulbar and penile parts. Injuries in the perineal area usually affect the anterior urethra, especially the bulbar part. That's because the perineum is where the bulbar urethra runs, and trauma here can cause rupture.

When there's a bulbar urethral injury, urine can extravasate into the surrounding tissues. The perineum, scrotum, and penis are part of the same potential space, so swelling and blood there make sense. Also, the inability to urinate and blood at the meatus (urethral bleeding) are classic signs of urethral injury.

The options are likely different parts of the urethra or other structures. The correct answer should be the bulbar urethra. Let's see the distractors. If an option mentions prostatic urethra, that's part of the posterior and less likely in perineal injury. Membranous is also posterior. Penile urethra is part of the anterior but maybe more distal. The question mentions swelling in the penis and scrotum, which aligns with bulbar injury because the bulbar part is closer to those areas. Also, a penile urethral injury might cause more localized swelling without involving the scrotum as much.

So, the key here is knowing the anatomy and the typical presentation of bulbar urethral injury. The clinical pearl is that perineal trauma leading to urethral injury typically affects the bulbar part, causing urine extravasation into the perineum, scrotum, and penis, and presenting with meatal blood and retention.

**Core Concept**
This question assesses knowledge of male urethral anatomy and the clinical presentation of urethral injuries. The male urethra is divided into **posterior (prostatic and membranous)** and **anterior (bulbar and penile)** segments. Perineal trauma commonly injures the **bulbar urethra**, leading to urinary retention, meatal bleeding, and perineal/scrotal swelling due to urine extravasation.

**Why the Correct Answer is Right**
The **bulbar urethra** runs through the perineum and is the most common site of injury in perineal trauma (e.g., straddle injuries). Rupture here causes **urine extravasation** into the **superficial perineal pouch** (penis, scrotum, perineum), explaining the swelling. Meatal bleeding (blood at the urethral meatus) and **inability to void** despite urge suggest urethral disruption. The bulbar segment is retroperitoneal and lacks fascial barriers to contain urine, leading to widespread swelling.

**Why Each Wrong Option is Incorrect**
**Option A:** *Prostatic urethra* injuries are rare and typically result from pelvic fractures. They cause **retroperitoneal urine extravas

✓ Correct Answer: B. Bulbar urethra