part of develops from ends during starts during vein venous endothelium external jugular vein UBERON:0001101 One of the bilateral pairs of vessels clearly seen on the ventral surface of the head, running between the heart and the tip of the jaw, and draining the filter apparatus. This vein is more developed by NF stage 45, when it crosses the head dorsolaterally to drain into the Duct of Cuvier and pronephric sinus. external jugular XAO:0000379 xenopus_anatomy death head vasculature NF stage 40