Interscalene approach to brachial plexus block does not provide optimal surgical anaesthesia in the area of distribution of which of the following nerve –: (A) Musculo cutaneous, (B) Ulnar, (C) Radial, (D) Median
Answer is B. Ulnar nerve is usually spared by interscalene approach because injection is given in close proximity of upper nerve roots and inferior nerve roots (C8-T1) may be spared.