In case of Blockade of 2nd pa of axillary aery blood supply to upper limb is maintained by which anastomosis -

Ans. is'a'i.e., Dorsal scapular anastomosis(Ref: Clinical anatomy 3d/e p. 756)Dorsal Scapular Anastomosis:This anastomosis occurs connects the 1st pa of subclan aery to the third pa of axillary aery providing an alternate route of flow of blood in case of occlusion anywhere within the subclan and axillary aery.