Around the 26th day of embryo development, mesoderm cells replicate rapidly under the influence of morphogens, leading to the development of the upper limb (Guéro 2018). Initially, the upper limb contains only a capillary network, which develops into the overall vasculature (Al-Qattan et al. 2009). The development of the ulnar artery is preceded by a border vein that appears on day 14 (Al-Qattan et al. 2009). Subclavian–axillary–brachial axis arteries appear between days 33 and 36 of development, the brachial artery eventually giving rise to the median artery (Al-Qattan et al. 2009). Around 41 days of development, the ulnar artery appears, replacing part of the median artery (Al-Qattan et al. 2009).