The abdominal cavity is bounded by the endoabdominal (commonly called transversalis) fascia. The peritoneal cavity is the potential space between parietal and visceral peritoneum. The extra-/retroperitoneal space lies between parietal peritoneum and transversalis fascia. This plane is easily separated surgically and pathologically (pelvic fracture hematoma, leaking aneurysm). The domes of the diaphragm rise to nipple level. Any penetrating injury below the nipples should be considered potentially intraperitoneal.
Hepatic veins are central within the coronary ligaments of the dome of the liver (bare area). Here they are subject to iatrogenic (mobilizing left triangular ligament) and blunt injury. Difficult access mandates immediate packing for damage control. Transverse mesocolon crosses the pancreas, allowing dissection of pancreatic enzymes in pancreatitis to damage colon.
The proximity of the neck of the pancreas to the anterior abdominal wall and the underlying anvil of the lumbar vertebra is the mechanism for crush/transection of the neck with blunt trauma (e.g. lower edge of steering wheel).