- Thoracic Cavity – heart (and other cardiovascular organs), lungs (and other respiratory organs), esophagus, trachea, thymus, several blood vessels
- Cranial Cavity - brain
- Abdominal Cavity - stomach, spleen, liver, gallbladder, small intestine, and most of the large intestine, adrenal glands, pancreas, kidneys
- Pelvic Cavity - urinary bladder (and other organs of the urinary system except kidneys), portions of the large intestine, and internal organs of the reproductive system
- Mediastanum – heart, esophagus, trachea, thymus, several blood vessels