Fetal_Development

Fetal Development Before human development can begin fertilization, the fusing of the sperm and the egg in the fallopian tube, must occur for it to become a zygote. The developing embryo, is called a zygote at this stage, floats down the fallopian tube towards the uterus. The first week of development is called the period of cleavage. Shortly after fertilization the zygote cleaves into 2 cells then to 4 cells, 8 cells and so on. Around the third day it’s about 16 cells, it is called a morula. Once in the uterus, the developing embryo, called a blastocyst searches for a nice place to implant ,where it burrows beneath the surface of the uterus. The second through the eight week of development mark the embryonic phase E arly in the phase the cells of the embryo begin to split into three different cells ,the endodoerm and the ectoderm form first and then the mesoderm forms in between. These layers will form all of the body organs. The ectoderm, will from the nervous system, the skin , and the lining of the mouth and anal canal; The mesoderm will form the muscle, bones the cardiovascular system, and the reproductive system; and the endoderm will form the digestive tract, respiratory tract fetal, fetus, embryo, month, skin, development, cells, body, it’s, called, brain, birth, system, now, mother, form, first, end, day, cord, blood, stage, organs, heart, hair, growth, fluid, developing, begins, baby, after, zygote, umbilical, time, through, per, months, life, length, head, eight, covered, begin, amniotic, about, weighs, weeks, week, very, taste