(A) Composite ultrasound image of the IO and TA tapering off posteriorly into their common aponeurosis adjacent to the QL. (B) The needle tip is positioned just under the aponeurosis of the TA. Injection in this location should result in visible LA spread in the TFP, as shown.
EO: external oblique; IO: internal oblique; TA: transversus abdominis; QL: quadratus lumborum; LA: local anesthetic; TFP: transversalis fascia plane.