Rectus Abdominis

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Other Names Waist (Belly) Abdominal Abs Heads Rectus Abdominis Movement Spine (Lumbar) Flexion Attachments Origin Pubis Crest Insertion Ribs (5 th, 6 th, & 7 th) Cartridge Xipoid Process Related Muscles Obliques Comments Rectus abdominis controls the tilt of the pelvis and curvature of the lower spine. It also tilts pelvis forward improving the mechanical positioning of the erector spinae. See abdominal weakness.