The Obliques - Trigger Point Anatomy      Trigger Points in the Obliques can be the Cause of Stomach, Chest, or Groin Pain The posterior fibers of the external oblique are usually overlapped by the latissimus dorsi, but in some cases there is a space between the two, known as the lumbar triangle, situated just above the iliac crest. The lumbar triangle is a weak point in the abdominal wall.   External Oblique - Common Trigger Point Sites   ORIGIN Lower eight ribs. INSERTION Anterior half of iliac crest, and into an abdominal aponeurosis that terminates in the linea alba...