The<unk>  (or transverse<unk>  is a<unk>  separating the superior lobe from the middle lobe.
The left lung has no middle lobe, so there is no<unk><unk>  on that lung.
The<unk><unk>  usually extends from the oblique<unk>  along the border of the 4th rib.
Horizontal fissure of right lung
Inferior border of lung
Hilum of lung
Mediastinal surface of lung
Right border of heart
Costomediastinal recess
Mediastinal pleura
Left lung