Umbilical vein has been substituted for artery in vascular transplantation, but it remains unclear whether the stress relaxation and creep between these vessels are consistent. A recent study reported in the Neural Regeneration Research (Vol. 8, No. 32, 2013) showed that the stress decrease at 7 200 seconds was similar between the middle cerebral artery and fetal umbilical vein specimens, regardless of initial stress of 18.7 kPa or 22.5 kPa. However, the strain increase at 7 200 seconds of fetal umbilical veins was larger than that of middle cerebral arteries.
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