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Umbilical vesicle process

The mesodermal strand leading away from the umbilical vesicle process (Y.S.P.) does not end in this section, but continues on across the chorionic cavity. Above the umbilical vesicle 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.

Fig. 29. Heuser et al., 1945.

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Keywords: allantoic duct, body stalk, chorionic cavity, umbilical vesicle process

Source: The Virtual Human Embryo.