Embryo 7802 - Stage 7
Fig. 29. Heuser, Rock and Hertig, 1945.
The mesodermal strand leading away from the yolk-sac process (Y.S.P.) does not end in this section, but continues on across the chorionic cavity. Above the yolk sac there are irregular groups of cells in the body stalk, some of which occupy the space between the proximal and detached parts of the allantoic duct. Section 387.
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