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

Figure 4

Ultrasound identification of the transversus abdominis plane. RA: rectus abdominis; TA: transversus abdominis; IO: internal oblique muscle; EO: external oblique muscle; QL: quadratus lumborum; L. alba: linea alba; L. semilunaris: linea semilunaris.