it then descended obliquely into the thorax , fracturing the second and third ribs and after penetrating the left lobe of the lung and dividing a large branch of the pulmonary artery , it entered the left side of the spine , between the sixth and seventh dorsal vertebrae , fractured the left transverse process of the sixth vertebrae , wounding the medulla , and , fracturing the right transverse process of the seventh vertebrae , it made its way through the right side of the spine , directing its course through the muscles of the back and lodged therein , about two inches below the inferior angle of the right scapula .