Which part lines the inner surface of the body wall?

• A. Parietal peritoneum
• B. Visceral peritoneum
• C. Serous membrane
• D. Omentum

Answer: (A)

The inner surface of the abdominal body wall is lined by the parietal peritoneum. The peritoneum is a serous membrane with two layers: the parietal layer that lines the walls of the cavity, and the visceral layer that covers the organs. The space between these layers contains a small amount of serous fluid. The visceral peritoneum covers the organs themselves, and the omentum is a fold of peritoneum connecting organs, not a lining of the wall. So the lining the inner surface of the body wall is the parietal peritoneum.