<prompt> In postductal coarctation of aoa, collaterals may be formed by all of the following, exceptVeebral aerySuprascapular aerySubscaular aeryPosterior Intercostals aery  <response>: In post-ductal coarctation of the aoa, an extensive collateral circulation develops involving the branches of subclan axillary aeries with the distal aeries given by aoa Veebral aery does not play a significant role in this collateral circulation. Ref: Grays 40ep984 