Tuesday, April 7, 2009

My Wife Is Pregnant - Day 20

Copyright © Jeremy Sandy
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246 Days To Go

The next thirty days mark a critical period in the development of the baby's heart. While the heart itself consists of just two heart tubes, it has been joined to blood vessels in the baby's system. The next ten days mark a critical period in the development of the central nervous system. The mesoderm is now dividing into matched pairs on either side of the spinal column. These matched pairs of tissue called "somites" will eventually form the bones and muscles of the baby's head and body. Today, the first pair of somites will appear and thirty-eight pairs of somites will form between now and day thirty. The thyroid gland, eventually located a the base of the neck on either side of the windpipe, is also beginning to form. Today was a big day in the development of the baby's muscles, bones, and heart.

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