Fig. 2From: Effect of quadratus lumborum block on postoperative cognitive function in elderly patients undergoing laparoscopic radical gastrectomy: a randomized controlled trialUltrasonographic image of QLB. Arrow shows the direction of needle. EO, external oblique muscle; IO, internal oblique muscle; TA, transversus abdominis; QL, quadratus lumborum; PM, psoas major; ES, erector spinaeBack to article page