Fig 1.

Examples of ScanNav Anatomy Peripheral Nerve Block colour overlay. ISB (interscalene level brachial plexus block): AS, anterior scalene; C5, C5 nerve root; C6, C6 nerve root; MS, middle scalene. AxBP (axillary level brachial plexus block): AA, axillary artery; AV, axillary vein; CT, conjoint (common) tendon of latissimus dorsi/teres major; McN, musculocutaneous nerve; MN, median nerve; RN, radial nerve; UN, ulnar nerve. ESP (erector spinae block): ESM, erector spinae muscle group (and overlying muscles); TP, transverse process. RSB (rectus sheath block): P, peritoneum; RA, rectus abdominis; RSa, rectus sheath (anterior layer); RSp, rectus sheath (posterior layer). ACB (adductor canal block): FA, femoral artery; SaN, saphenous nerve; SM, sartorius muscle. SNB (popliteal level sciatic nerve block): CPN, common peroneal (fibular) nerve; TN, tibial nerve.