Full Internal Abdominal Oblique Muscle Description
[Continued from above] . . . One side also bends the vertebral column sideways and rotates it, bringing the shoulder of that side forward. The external abdominal oblique muscle is also irregularly four-sided in form and lies superficial to the internal oblique muscle. Both sides, acting together, flex the vertebral column, drawing cartilage down toward the pubis. One side acts alone bending the vertebral column sideways, rotating it to bring the shoulder of the opposite side forward. Both of the abdominal oblique muscles work to compress abdominal contents, assist in the digestive process and in forced expiration.