The EMT recognizes that the division between the thoracic and abdominal cavities lies approximately at the fifth intercostal space. The diaphragm is a muscular and membrane partition that separates the abdominal cavity (the body's largest hollow space) from the rib cage, the spinal column, and the sternum, or breastbone.
The aorta is the body's biggest artery and the blood conduit that transports oxygen-rich blood from the heart to all regions of the body. The thoracic aorta is the segment of the aorta that runs through the chest, and the abdominal aorta is the section of the aorta that travels through the belly.
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