<prompt> Exposure of left subclan aery by supraclavicular approach does not require cutting of ?SternocleidomastoidScalenus anteriorScalenus mediusOmohyoid  <response>: Scalenus medius lies posterior to the subclan aery and thus need not be divided to expose the aery. Whereas, sternocleidomastoid scalenus anterior lie anteriorly and omohyoid lies superiorly and thus are cut during exposure of the subclan aery. 