Those Amazing Eggs and Embryos


eggs and embryo facts: blastocyst photoDid You Know…?

The mechanism of reproduction is truly astounding in all sorts of ways, and some of the most amazing things about it involves egg cells and the embryos that form from them.

For instance, did you know the following facts about eggs & embryos?

~ The ovum (egg cell) is the largest cell of any type in the human body. (The sperm cell is the smallest.)

~ Up to the age of six days, an embryo’s cells essentially act as stem cells, with the ability to form any part of the body. (This means that PGD biopsies on 8-cell embryos aren’t doing any harm; the missing bit will be replaced.)

~ Frozen eggs can remain valid for an amazingly long time. One successful fertilization came from an egg that had been frozen for 25 years!

~ Not only can eggs be frozen for use at a later date, but so can embryos. The process, known as cryopreservation, is performed on 6-cell or larger embryos. While many embryos do not survive the freezing, successful births have come from this technique.

~ The embryo’s gender is not apparent until around the eight week of development. Only at this point do make and female characteristics emerge.

~ Within just six weeks of conception, an embryo’s heart begins pumping blood, facial features begin to form, arm buds have sprouted, and the neural tube that will develop into the spinal cord has closed.

~ A newborn baby girl has over a million eggs within her, but only 300,000 of them will still be there for her adolescence. By the time she’s 30 years old, the number of ova has decreased to 30,000.

Get the Facts — and Get Results

Want to learn more amazing fertilization facts — or experience them for yourself? Contact Dallas – Fort Worth Fertility Associates and let’s talk about it!


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