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Inspect the abdominal viscera in situ (Figure 37.3). The space that has been opened is the major portion of the peritoneal cavity, called the greater peritoneal sac. This space is located between the inner surface of the abdominal wall and the outer surface of the abdominal viscera. The greater peritoneal sac is bounded between the parietal and visceral peritoneum. It communicates through the epiploic foramen (of Winslow) with the smaller, lesser peritoneal sac (also called omental bursa). The lesser peritoneal sac is the largest recess of the peritoneal cavity and is located posterior to the stomach. Its boundaries will be described later.
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