Cranially they extend to the first thoracic vertebrae and inferiorly to the dome of the diaphragm and costophrenic sulci more inferiorly. Posteriorly, on a chest X-Ray they reach to the 10 rib. Within the thorax the lungs extend superiorly passed clavicle into the base of the neck, with a craniocaudal length in inspiration of approximately 24 cms. Additionally, their size can change dramatically since the difference in volume between a deep inspiration and deep expiration can be as much as 3.5 liters. The lungs are one of the more voluminous organs in the body but in terms of weight are relatively light for their size, since they mostly are filled with air. ![]()
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