a. Thoracic cavity
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Lungs, trachea, heart, blood vessels/major arteries (not technically organs, but part of the organ system), esophagus, thymus
b. Cranial cavity
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brain, spinal cord
c. Abdominal cavity
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liver, stomach, spleen, pancreas, kidney, small intestine, large intestine, gallbladder
d. Pelvic Cavity
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reproductive organs, urinary bladder, rectum
e. Mediastinum
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heart, thymus, esophagus, trachea, large blood vessels (not technically organs, but part of the organ system)