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Introduction to Lungs Anatomy

  • The soft, elastic lungs occupy most of the thoracic cavity and are protected from injury by the surrounding the image descriptionsternum and image descriptionrib cage.
A view of the rib cage
A view of the rib cage and lungs with rib cage labeled
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A view of the rib cage
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  • A large portion of each lung consists of image descriptionblood vessels (arteries, veins, & capillaries) and image descriptionrespiratory tubes (bronchi, bronchioles, & alveolar ducts).
A view of the rib cage
Blood vessels labeled
Respiratory tubes labeled
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  • Most of the lung volume, however, is made of small clusters of alveoli. Each image descriptionalveolus is a small, thin-walled, cup-shaped sac that protrudes from the smallest air ducts.
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  • There are approximately 300 million alveoli in each lung, and they are the regions where gases are exchanged with nearby capillaries.

An Overview of Lung Anatomy:

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