11. In infants, they typically result from a minor defect of the linea alba between the rectus abdominis muscles. 12. During pregnancy, the growth of the fetus exerts pressure on abdominal cavity muscles, in particular the rectus abdominis . 13. Confusingly, fascia recti is described in some anatomy books, referring to the fascia of the rectus abdominis muscle. 14. The rectus abdominis , now reduced in number to two, with the top one incorporated into lower boundary of thorax. 15. The obliques, rectus abdominis and psoas minor work eccentrically to stabilize the spine, and the spinal muscles work concentrically. 16. It should be going into posterior pelvic tilt if the movement is being done to target the rectus abdominis . 17. The rectus abdominis muscle is contained in the rectus sheath, which consists of the aponeuroses of the lateral abdominal muscles. 18. Superior to the arcuate line, the internal oblique aponeurosis splits to envelop the rectus abdominis muscle both anteriorly and posteriorly. 19. The angle of the gallbladder is located between the costal margin and the lateral margin of the rectus abdominis muscle. 20. Above the arcuate line, the rectus abdominis is surrounded by an anterior layer of the rectus sheath and a posterior layer.
