And the line, the fissure that separates these two lobes on the left lung is known as the left oblique fissure. Oblique simply means it's at an angle, it's slanted. Now, on the other hand, the right lung, which is slightly larger, consists of three different lobes. We have an upper or a superior lobe, and then we have a middle lobe. And the line separating these two lobes is straight, or relatively straight. And that's exactly why we call it the horizontal fissure.