Title: How does an Embryo Develop Into a Fetus - Some Interesting Facts
Headings: How does an Embryo Develop Into a Fetus
How does an Embryo Develop Into a Fetus
Week by week

Content: All being well, the developing embryo will settle into the folds of the womb lining. Week 2 – The inner cells of the embryo divide into two layers: the ectoderm and the endoderm. The tissues and organs of the body will eventually develop from these. The amniotic sac, which will soon form a protective bubble around the embryo, also starts to develop. The embryo, now completely embedded in the womb, is a disc-shaped mass of cells, measuring roughly 0.2mm (0.008in) in diameter. Week 3 – At the start of week 3 a groove will form towards what will become the tail end of the embryo; this is the primitive streak. A new layer of tissue-the mesoderm-will develop from the primitive streak. The spinal cord, kidneys and major tissues will all grow from this.