Ultrasound-Guided Quadratus Lumborum Block: An Updated Review of Anatomy and Techniques

Figure 9

Ultrasound images of posterior QLB. (a) Preinjection and (b) postinjection. EO: external oblique muscle, IO: internal oblique muscle, TA: transversus abdominis, QL: quadratus lumborum, white arrow: needle trajectory, and white dotted line: spread of local anesthetic.

(a)

(b)