Which cavity contains the abdominal cavity and pelvic cavity?

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Discerning how the major body cavities are organized, the space that contains both the abdominal and pelvic regions is the abdominopelvic cavity. It sits below the diaphragm and extends from just under the ribs down into the pelvic area, effectively housing both the abdominal organs (digits like stomach, intestines, liver) and the pelvic organs (reproductive organs, bladder, portions of the digestive tract). The thoracic cavity sits above the diaphragm and contains the heart and lungs, separate from the abdominopelvic cavity. So the abdominopelvic cavity is the correct concept for containing both the abdominal and pelvic regions.