Tags: Anatomical Structure.
The horizontal fissure of right lung (or transverse fissure) is a fissure separating the superior (upper) lobe from the middle lobe.The left lung has no middle lobe so there is no horizontal fissure on that lung.The Horizontal fissure usually extends from the oblique fissure in the mid-axillary line to the 4th costal cartilage.
