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- The main trunk cavities are the thoracic and abdominopelvic cavities.
- The thoracic cavity is also called the chest cavity.
- It is formed by the ribs, sternum, chest muscles, and thoracic vertebrae.
- The thoracic cavity contains the pericardial cavity around the heart.
- It also contains two pleural cavities, each surrounding a lung.
- The mediastinum is the central region between the lungs.
- It extends from the sternum to the vertebral column.
- It also extends from the first rib to the diaphragm.
- The mediastinum contains organs except the lungs.
- These organs include the heart, esophagus, trachea, thymus, and major blood vessels.
- The diaphragm separates the thoracic cavity from the abdominopelvic cavity.
- The diaphragm is a dome-shaped muscle.
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