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250 Days To Go
A groove is forming within the primitive streak through which cells will migrate to form three layers of tissue:
- The endoderm
- The mesoderm
- The ectoderm
All of the baby's cells and organs will form from these three tissue layers. The bottom later of cells (endoderm) forms the glands, lining of the lungs, tongue, tonsils, urethra and associated glands, bladder, and degestive tract.
The middle layer of cells (mesoderm) forms the muscles, bones, lymphatic tissue, spleen, blood cells, heart, lungs, and reproductive and excretory systems.
The top layer of cells (ectoderm) forms the skin, nails, hair, lens of the eye, lining of the internal and external ear, nose sinuses, mouth anus, tooth enamel, pituitary gland, mammary glands, and all parts of the nervous system.
In addition, the cells from the middle layer will migrate to form a woven support for the developing organs. Another group of cells form clumps called blood islands, which begin to form the baby's first blood cells. The genetic blueprint in each cell tells the cell what to do and orders its migration to the spot in the baby's body where the development will take place. It is a truly amazing process!
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