The horizontal fissure divides the middle and upper lobes of the right lung and the upper and lower lobes of the left lung. The right and left lung feature fissures which divide the overall structures into smaller lobes. The left lung has one horizontal fissure which divides it into two lobes (upper and lower). The right lung has one horizontal fissure and one oblique fissure, dividing the right lung into three lobes (upper, middle, and lower). Because of this third lobe, the right lung is larger than the left, extending further down in the abdominal cavity. The right and left lung are each enclosed in a pleural sac and are separated by the mediastinum, a membrane which extends from the vertebral column in back to the sternum in front. Research Horizontal Fissure
The oblique fissure divides the middle and lower lobes of the right lung. The right and left lung feature fissures which divide the overall structures into smaller lobes. Research Oblique Fissure
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Horizontal Fissure
