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.

Similarly to the other abdominal muscles, external oblique myofascial trigger points can refer pain anywhere locally throughout the abdominal region.

This pain is often exacerbated during the menstrual cycle. Pain can refer down into the groin and sometimes to the testicles.

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