Fig. 2From: Rhomboid intercostal block versus serratus block for postoperative analgesia after thoracoscopic sympathectomy for primary palmar hyperhidrosis: a randomized controlled trialThe serratus anterior block technique: (A) Sonographic anatomy of the layers encountered during serratus block. (B) Directing the needle to the plane between serratus and latissimus dorsi muscles. (C) Spread of the local anesthetic injectate in the proper planeBack to article page