External obliques function

• A. External obliques - assist with stabilization, lateral flexion and rotation
• B. Flexion of the hip
• C. Stabilize the pelvis only
• D. Primary spinal extension

Answer: (A)

The external obliques are part of the abdominal wall that both stabilizes the torso and powers movement of the trunk. They run diagonally from the lower ribs to the pelvis, so when one side contracts, the fibers pull the ribcage and pelvis toward each other, producing rotation to the opposite side and lateral flexion toward the same side. When both sides contract, they help flex the spine and brace the core, aiding stability during lifting. They also increase intra-abdominal pressure to support the spine.

That combination—stabilization plus lateral flexion and rotation—fits what these muscles do best. Hip flexion is primarily handled by hip flexors like the iliopsoas; the external obliques are not responsible for primary spinal extension (that’s the back extensors), and their role isn’t limited to just pelvic stabilization.