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A. Application of the probe over the edge of the iliac crest of the ilium, anterior to the quadratus lumborum muscle; direction for moving the probe (arrow). B. The ilioinguinal nerve (rightward arrow), the iliohypogastric nerve (leftward arrow); the iliac crest (CI), the external oblique (OEx) and internal oblique (OInt) abdominal muscles, the transverse abdominis muscle (Tr)
