<prompt> Structure contained within rectus sheath are all exceptInternal thoracic aerySuperior epigastric aeryInferior epigasbric aeryRectus abdominis  <response>: The rectus sheath is formed by the aponeuroses of the transverse abdominal and the external and internal oblique muscles. It contains the rectus abdominis and pyramidalis muscles. It can be divided into anterior and posterior laminae. image ref - researchgate.net 