Fig. 7-11. O'Rahilly
and Muller, Developmental Stages in Human Embryos, 1987.
Embryo No. 7802, stage 7, to show the primitive streak, which appears as a group of cells emerging from the ventral surface of the epiblastic plate. The wall of the umbilical vesicle is trilaminar. Section 44-1-2.
| Next Figure |
| Previous Figure |
| Return to Index |
| Return to Introduction |