Transversus Abdominis Plane Block: An Updated Review of Anatomy and Techniques

Figure 7

Posterior approach of transversus abdominis plane (TAP) block. (a) The probe position and needle trajectory. The probe is placed posterior to the midaxillary line between the costal margin and the iliac crest. The needle is inserted in plane. (b) Corresponding ultrasound images. Posteriorly, transversus abdominis tails off and turns into the aponeurosis. The quadratus lumborum can be seen posteromedial to the aponeurosis. The injection site is at the TAP between internal oblique and transversus abdominis posterior to the midaxillary line and near the aponeurosis. White dashed line: needle trajectory. Light blue area: the deposition site of local anesthetic. TA: transversus abdominis; IO: internal oblique; EO: external oblique; QL: quadratus lumborum.

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