Final answer:
The greater sac of the peritoneal cavity refers to the largest part of the abdominal cavity, which is bounded by the visceral and parietal peritoneal layers.
Step-by-step explanation:
The greater sac of the peritoneal cavity is the largest part of the abdominal cavity. The anterior (ventral) cavity of the human body consists of two main subdivisions, where the thoracic cavity houses the heart and the lungs and is separated from the abdominopelvic cavity by the diaphragm. The abdominopelvic cavity can be further divided into the abdominal cavity, containing digestive organs, and the pelvic cavity, containing reproductive organs. The peritoneal cavity specifically is the space bound by the visceral and parietal peritoneal layers, with the greater sac being the main and larger part of this cavity.