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: 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. Cells from the ectodermal tissue create the neural fold and plate, the first stages in the development of the nervous system. The neural groove will go on to form the spine. Week 4 – The kidneys are forming from mesodermal tissue and the mouth is emerging. A basic spinal cord and gut now run from the head to the tail. The head and tail fold downward into a curve as a result of the embryo developing more rapidly from the front.