Anaesthesia Anaesthesia of special situations 73ee2bf3 In Phrenic nerve block, it is best to infiltrate near A Scalenus anterior B Scalenus posterior C Posterior border of sternomastoid D Anterior border of sternomastoid High-Yield Explanation Phrenic nerve is blocked 3 cm above the clavicle at the posterior border of sternomastoid. Used for intractable hiccups