![](/drem/stage9/labels/S133L.gif)
![allantois, endoderm, gastrulation (primitive) groove, left umbilical artery, left umbilical vein, mesoderm, neural cord, right umbilical artery, right umbilical vein, surface ectoderm](/drem/stage9/Z0/S133N.jpg)
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Carnegie Embryo #3709 | Location: 02-03-08
Keywords: allantois, endoderm, gastrulation (primitive) groove, left umbilical artery, left umbilical vein, mesoderm, neural cord, right umbilical artery, right umbilical vein, surface ectoderm
Source: The Virtual Human Embryo.