Fig. 7
From: Fascial plane blocks for cardiothoracic surgery: a narrative review
A Sono-anatomy of SAPB: In the superficial SAPB, the target is the interfascial plane between LD and SAM; in the deep SAPB, the target is the interfascial plane between SAM and the periosteum of the V rib. B Deep SAPB: the needle is advanced in-plane in the interfascial plane between the SAM and the V rib and LA is injected. LD, latissimus dorsi; SAM, serratus anterior muscle; P, pleura; LA, local anesthetic; N, needle