The Musculus obliquus externus abdominis (lat. for „outer oblique abdominal muscle“) originates alternately with the spike of the Musculus serratus anterior and the Musculus latissimus dorsi from the fifth to the twelfth rip. It pulls with its abdominal tendon (Crus mediale) to the Linea alba and with the pelvic tendon (Crus laterale) to the ilium.