 In the first part of this video, we can see an ultrasound scan of the interscalene to supraclavicular level brachial plexus. In the display here, we see the first rib highlighted in blue and the subclavian artery in red, with the supraclavicular level brachial plexus nerves in yellow. The pleura in purple lies either side of the rib. Scanning superiorly in the neck, we can see scaleneus anterior muscle lying anteriorly to the nerves and sternocleidomastoid muscle, both highlighted in green. For the auxiliary level brachial plexus, you see the proximal medial arm. Here we see the auxiliary artery highlighted in red and the four nerves of this level highlighted in yellow. The fascia overlying the conjoined tendon of latissimus dorsi and teres major is highlighted in orange and the humerus in blue. For the erectus spinae plane block, the ultrasound probe is placed in a longitudinal orientation, a parasagital position. In muscles of trapezius, rhomboid major and the erectus spinae muscle group are highlighted in green. The bone is highlighted by blue when over the rib or yellow when over the transverse process. The pleura is highlighted in purple. For the erectus sheath block, the erectus abdominis muscle is highlighted in green and the surrounding rectus sheath itself in orange. Contents of the peritoneal cavity are highlighted in brown. For the suprainguinal fascia aliaca block, the aliacus muscle itself is highlighted in green with the overlying fascia in yellow and the underlying bone in blue. The deep circumflex iliac artery is highlighted in red. The adductor canal block of the anterior medial thigh shows sartorius muscle and the adductor longus highlighted in green. The femoral artery in red with the adjacent saphenous nerve in yellow and the femur in blue. Popliteal level sciatic nerve block of the posterior inferior thigh shows the sciatic nerve and its two elements, the tibial nerve and the common perineal or fibular nerve. These are highlighted in yellow. The popliteal artery in red, the compressible popliteal vein is not highlighted.