Embryo No. 7802, stage 7, to show the primitive node, which appears as a rearrangement of cells in and ventral to the middle of the epiblastic plate. A surface elevation is not present here. Section 44-2-2.
Fig. 7-10. O'Rahilly and Müller, 1987.
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Keywords: epiblastic plate, primitive node
Source: The Virtual Human Embryo.