Thoracic outlet

The thoracic outlet is the lower opening of the thoracic cavity whose edges are the lowest ribs. It is closed by the diaphragm, which separates the thoracic cavity from the abdominal cavity. The thoracic outlet or inferior thoracic aperture is much larger than the thoracic inlet (superior thoracic aperture). The thoracic outlet is the lower opening of the thoracic cavity whose edges are the lowest ribs. It is closed by the diaphragm, which separates the thoracic cavity from the abdominal cavity. The thoracic outlet or inferior thoracic aperture is much larger than the thoracic inlet (superior thoracic aperture).