Electrophysiological analysis reveals steady outward electrical currents across the primitive streak in chick embryos, indicating localized ionic leakage driven by epiblast pumping.
The electrical fields above chick embryos were explored with a vibrating probe. These fields indicate that steady currents with exit densities of the order of 100 microamperes per square centimeter leave the whole streak and return elsewhere through the epiblast. The epicenter of these strong exit currents lies near Hensen's node. They are probably pumped into the intraembryonic space by the epiblast and then leak out of the streak because it is a zone of junctional disruption.
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Jaffe et al. (1979) studied this question.
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