block will block 4 major branches --antero lateral neck sensory innervation
landmarks: mastoid process-->midpoint (Chassaignac's tubercle of C6 transverse process)-->
branches emerge from posterior border of SCM
fan block and midpoint of the line
depth: superficial only, no more than 1-2cm
shud not have paraesthesia
sensory block only so dilute ok: 0.25% bupivacaine, 10 ml (5 up 5 down)
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