Saturday, March 24, 2012

Fearfully and wonderfully made

After a sperm fertilizes an egg, a zygote is formed:

Next, the zygote divides and divides and divides into more cells:

Here's a schematic of the same or similar enough (if the words seem like gibberish, don't mind them too much, just focus on the pictures for now):

BTW, here's the main part of the female reproductive tract:

Now this is the progression of human development from conception to the end of the first week (again, never mind the words and names, just start on the cell labeled zygote traveling down the uterine or Fallopian tube toward the uterus):

This is how the developing baby looks at so many days (term is ~38-41 weeks):

Here's a close-up of the baby at 56 days old:

Finally (CRL refers to crown-to-rump length, which is a simple measurement of the baby's size in centimeters):

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