Respiratory system anatomy in 3D:
isolated

The isolated respiratory tract, from the larynx and trachea to the bronchi and lungs.

The right lung has three lobes, separated by the oblique and horizontal fissures, while the left lung has two lobes and a cardiac notch. Each main bronchus enters the lung at the hilum and divides into lobar and then segmental bronchi, down to the bronchioles and alveoli.