Fig. 5

Cadaveric dissection: Ultrasound guided posterior parasagittal in-plane infraclavicular right brachial plexus block (a) needle insertion posterior to clavicle plus injection of dye solution 25 ml normal saline plus 0.2 ml methylene blue, (b) Right brachial plexus; Note the median and ulnar nerves were less stained compared to musculocutaneous and radial nerves (c) needle advancement after passing clavicle, needle trajectory - horizontal, easy direction towards target point, good needle visualization (d) Dye solution deposit on posterolateral aspect of axillary artery, creating double bubble sign