Rectus Abdominis movements include which action?

Rectus Abdominis movements include which action?

• A. Extend the Vertebral Column
• B. Abduct the Shoulder
• C. Flex Vertebral Column and Tilt Pelvis Posteriorly
• D. Plantar Flex the Foot

Answer: (C)

Rectus abdominis sits on the front of the abdomen and acts mainly to flex the trunk. When it contracts, it pulls the upper spine toward the pelvis, producing flexion of the vertebral column. Because its lower fibers attach near the pelvis, a strong contraction can also tilt the pelvis posteriorly, which helps flatten the lower back and reduce lumbar lordosis. This combination—flexing the spine and posteriorly tilting the pelvis—is the action described. It does not extend the spine (that’s done by the back extensors), nor does it move the shoulder or the ankle (which would be shoulder abduction or plantar flexion, respectively).

Rectus abdominis sits on the front of the abdomen and acts mainly to flex the trunk. When it contracts, it pulls the upper spine toward the pelvis, producing flexion of the vertebral column. Because its lower fibers attach near the pelvis, a strong contraction can also tilt the pelvis posteriorly, which helps flatten the lower back and reduce lumbar lordosis. This combination—flexing the spine and posteriorly tilting the pelvis—is the action described. It does not extend the spine (that’s done by the back extensors), nor does it move the shoulder or the ankle (which would be shoulder abduction or plantar flexion, respectively).