University of wisconsin-madison

Changes in the Embryonic Vesicle

In the graph below it is possible to see that the embryonic vesicle, as detected by ultrasoundography, grows during the time of uterine mobility (days 11 - 16) but then stops changing size until day 28. After day 28 the embryonic vesicle again begins to increse in diameter. After day 21 it is possible to now distinquish the embryo itself within the vesicle. Both the size of the vesicle and length of the embryo may be used to estimate the embryo's age using ultrasoundography.

graph of embryonic vesicle and embryo size

 

Day 16 Vesicle

ultrasound image of 16 day fetal vesicle

 

Day 22 vesicle and fetus

ultrasound image of 22 day vesicle

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