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On a marginally more academic subject I have been marvelling at the neural tube. For those who may not already know your brain starts out as a tube. It goes something like this...
Week 1: sperm reaches egg, starts to divide
Week 2: Fair few cells in a big blob
Week 3: Blob has organised into a sheet of 3 layers of different cells (endoderm, mesoderm and ectoderm) which will for all the different tissues and organs
Week 4: Sheet begins to fold up with a groove in the middle
Week 5: It forms a tube
Week 6: one end of the tube begins to grow massively and fold up - this will be your brain, the other end will be your spinal cord (all the other organs are growing too by the way
Somehow at week 9-10 there is a person about the size of the end of your little finger will fully developed organs which will then simply grow in size.
I like the idea that complex things are simply a long sequence of simple things stacked up on top of each other.
1 comment:
I like girls. too :)
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