<prompt> Exposure of left subclan aery by supraclavicular approach does not require cutting ofSternocleidomastoidScalenus anteriorScalenus mediusOmohyoid  <response>: Scalenus medius is located posterior to the subclan aery. Hence there is no need to cut this to expose the subclan aery. Ref - Bdc 6th e Vol 3 pg165,166 , pubmed.com 