Process of life
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Gastrulation occurs after 3 weeks of fertilization, forming the three germ layers - ectoderm, endoderm, and mesoderm. During the first week, membranes form to protect and nourish the embryo, including the amnion, yolk sac, chorion, and allantois. From weeks 12-23, the fetus grows to 25 cm and 0.5 kg, developing features like eyebrows and eyelashes. The heartbeat can be heard and the mother can feel movement. Later, the fetus assumes a fetal position and the sex is apparent as bones and other organs develop.
Process of life
- 2. Transition : after 3 weeks of fertilization a process called gastrulation takes place this comes from 3 cells
- 3. Ectoderm- is the outer layer it forms the embryo’s skins and central nervous system. Endoderm-is the inner layer it forms the lungs and digestive track Mesoderm- is the middle layer forms most of the other organs.
- 4. During the first week membranes form and protects the embryo as well nourishes it. the amino membrane forms the fluid like sac. The yolk sac membrane contains no yolk and produces first blood and eventually turns into gametes Chorion turns into the embryos potion of the placenta Allantois forms the part of the umbilical cord that connects the embryo to the placenta.
- 5. During week 12-23 The fetus length expands to 25 cm. and weight 0.5 kg. they start developing eyebrows and eyelashes with a face of an infant . At this point the heart beat can be heard and fetus can be active. The mother can feel flutters pokes and kicks.
- 6. Form into a fetal position Sex of fetus is apparent Baby skeletons develops bones Baby begins to hear Fingerprints and footprints form
- 7. Week 24-40 Baby's eyes open Baby bones are fully developed baby's central nervous system has matured to the stage where it can control body temperature Baby's fingernails grow Rapid gain weight begins Week 40 your due date arrives