M. Obliquus Abdominis Externus
Origin
5. to 12. Rip
Projection
Linea alba, Lig. inguinale, Crista iliaca, Tuberculum pubicum
Function
Flexion an rotation of the trunk , Exspiration
Innervation
Nervi intercostales (Th5 – 11), Nervus subcostalis
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.