<prompt> Aery forming anastomosis around surgical neck humerus -lst pa of axillary aery2nd pa of axillary aery3rd pa of axillary aerySubclan aery  <response>: Ans. isci.e., 3rd pa of axillary aeryAnastomosis around surgical neck of humerus is formed by -Anterior circumflex humeral aery.Posterior circumflex humeral aeryBoth are branches of 3rd pa of axillary aery. 