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Second, the arterial system of the upper limb starts to develop as a dispersed capillary network at day 26 when a bud of the future upper limb appears; the capillary network is connected to the axial artery.
Thus Singer has described five stages in which in a successive manner an axial artery, a median artery, an ulnar artery, a radial artery develop in the first four stages and then finally a stage where portions of the arteries regress or disappear and the adult pattern is established.
21] In another accepted theory, Singer suggested the limb arteries arise from a main axial artery and branches arise through axial sprouting.