External Abdominal Oblique

The External Abdominal Oblique fibers above the level of the ASIS run an inferomedial course from the lower ribs and crest of the ilium. Its aponeurosis above and below the ASIS contributes to the anterior layer of the rectus sheath. Its aponeurosis continues below the ASIS to the pubic tubercle and crest, and contributes to the formation of several ligaments: inguinal (Poupart's), lacunar (Gimbernat's), pectineal (Cooper's). Its fascia is associated with the superficial inguinal ring, and the outer covering of the spermatic cord.