Figure 4.

Boundary prediction of interscalene block (A): SCM sternocleidomastoid muscle, ASM anterior scalene muscle, BP brachial plexus, MSM middle scalene muscle; supraclavicular block (B): BP brachial plexus, SA subclavian artery, RS rip shadow, PL parietal pleura; infraclavicular block (C): PMaM pectoral major muscle, PMiM pectoral minor muscle, SV subclavian vein, SA subclavian artery and TAP block (D): EO external oblique, IO internal oblique, TA transversus abdominis, PC peritoneal cavity with predefined anatomic landmarks in color-labeled overlay (from [6]).