Each lung is divided into sections called lobes that are separated from each other by various fissures.

The right lung is divided into three lobes (superior lobe, middle lobe and inferior lobe) by the two following fissures:

Oblique fissure of the right lung - also called the major or great fissure - the superior fissure of the right lung that separates the inferior lobe from the middle lobe and superior lobe. This fissure begins at the level of the spinous process of the fourth thoracic vertebra (T4), goes obliquely forward and downward along the costal surface and then crosses the fifth intercostal space and further follows the contour of the sixth rib to reach the sixth costochondral joint;
Horizontal fissure (minor fissure) - a short fissure that separates the superior lobe and middle lobe. It arises from the right oblique fissure at the midaxillary line. The horizontal fissure goes along the fourth rib and fourth intercostal space forward and downward to reach the anterior border of the right lung.

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Lobes and fissures of lungs