Medial to the axilla is what artery?

As for the axillary vein, it begins as the union of the brachial veins with the basilic vein. It continues through the axilla, medial to the axillary artery, until it changes its name to the subclavian vein at the lateral border of the first rib. The axillary vein receives the cephalic vein and numerous other tributaries that roughly correspond to the branches of the axillary artery, though things are of course somewhat variable