Fig. 1
From: Fascial plane blocks for cardiothoracic surgery: a narrative review
A Superficial parasternal block. Patient and probe position. The needle is inserted with the in-plane approach in the cranial to caudal or caudal to cranial direction. B Ultrasound landmarks of superficial and deep parasternal block. From top to bottom: pectoralis major muscle, external intercostal muscle, internal intercostal muscle, transversus thoracis muscle, pleura, ribs. PMM, pectoralis major muscle; EIM, external intercostal muscle; IIM, internal intercostal muscle; TTM, transversus thoracis muscle