Name two muscles of the trunk and give their origin insertion and function

The two muscles of the trunk are Abdominal external oblique muscle and Abdominal internal oblique muscle. Their origin and function are in Abdominal external oblique muscle ; lower 8 costae, ligamentum iguinali, rotates torso and  Abdominal internal oblique muscle; inguinal ligament, sternum & inferior ribs, compresses abdomen. 

allowed for the prediction of the properties of missing elements.