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?
Correct Answer: Superior thoracic
Description: 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.
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Anatomy
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