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Secondary Pulmonary Lobules of the Lungs

Walls of connective tissue (or septa) partitioned the bronchopulmonary segments into many polygonal-shaped image descriptionsecondary pulmonary lobules (or pulmonary lobules).

Anterior view of the lungs
Anterior view of the lung with the label: Secondary pulmonary lobules
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  • The secondary pulmonary lobules measure approximately 1-3 centimeters in diameter and are most anatomically well-defined along the surface of the lungs.
  • A secondary pulmonary lobule typically contains (see the image below) 3-5 terminal bronchioles (the smallest conducting tubules) and many┬árespiratory bronchioles, alveolar ducts, and alveoli (where gases are exchanged with surrounding blood vessels).

A zoom-in of terminal bronchioles magnifying the secondary pulmonary lobule

An Overview of the Secondary Pulmonary Lobules of the Lungs:

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