Fig. 6From: Fascial plane blocks for cardiothoracic surgery: a narrative review A PECS 2 before injection of local anesthetic. B PECS 2 after injection of local anesthetic, which spreads into the fascial layers between pectoral minor and serratus anterior muscles. PMM, pectoralis major muscle; PMm, pectoralis minor muscle; SM, serratus anterior muscle; N, needle; LA, local anestheticBack to article page