Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

Left main bronchus.

Inferior pulmonary vein.

Left pulmonary artery.

Superior pulmonary vein.

Right main bronchus.

They are kept open by “C” shaped rings of cartilage.

They are the airways that branch from the left and right secondary bronchi.

The cartilage is absent in their wall. 

They are the airways that branch from the left and right primary bronchi.

Their walls have supporting cartilage between smooth muscle.

In the normal condition, pleural cavity is filled by air.

The parietal pleura is continuous with the visceral pleura at the hilum.

Pericarial cavity is between diaphragmatic and mediastinal surfaces of lung. 

The parietal pleura is supplied by the pulmonary circulation.

The fissures in lungs is usually covered by a layer of parietal pleura.