Anatomy - Pelvis & Perineum

The abdominal cavity is lined by peritoneum. 

Structures that are suspended in the abdominal cavity by a mesentery and that lie between the parietal peritoneum and abdominal wall are retroperitoneal in position.

Infections in the abdominal cavity cannot freely spread into the pelvic cavity. 

As vessels pass inferior to the inguinal ligament, their names change-the external iliac artery and vein of the abdomen become the femoral artery and vein of the thigh.

Pain from the abdominal part of the foregut is referred to the epigastric region, pain from the midgut is referred to the umbilical region, and pain from the hindgut is referred to the pubic region.