Which anatomical structure is primarily involved in determining a urethral blockage risk in male cats?

• A. The bladder neck
• B. The prostatic urethra
• C. The distal penile urethra
• D. The ureter

Answer: (C)

The main idea is that urethral blockage risk in male cats comes from the narrowest part of the urethra where materials can lodge. In male cats, that spot is the distal penile urethra, the portion of the urethra that runs through the penis near the end. Its relatively small diameter and mucosal folds make it easy for mucus plugs, crystals, or debris to become stuck, creating an obstruction. The bladder neck and proximal prostatic urethra are upstream and generally not the typical bottleneck for blockage. The ureter is a separate tube from kidney to bladder and does not contribute to urethral blockages. So, the distal penile urethra is the structure most involved in determining blockage risk.