<prompt> In a Subclan aery block at the outer border of 1st rib, all of the following aeries help in maintaining the circulation to upper limb except?Subscapular aerySuperior thoracicThyrocervical trunkSuprascapular aery  <response>: A rich anastomoses exists around the scapula between branches of subclan aery first pa the axillary aery third pa.This anastomoses provides a collateral circulation through which blood can flow to the limb when the distal pa of subclan aery or the proximal pa of axillary aery is blocked. 