PSY312H1 Lecture Notes - Lecture 2: Prenatal Development, Cell Migration, Zygote
Document Summary
Jan 14 lecture 2 prenatal development and the newborn period. Development begins at conception (the union of an egg from the mother and a sperm) Conception occurs when an ovum and sperm from a zygote (fertilized egg) For about five days, the zygote floats down the fallopian tube. About the fifth day after conception, the zygote implants itself in the uterine wall. From implantation until the 49th day after conception, the organism is called an embryo. More rapid amount of change during this period, which means it is also the most hazardous period because a lot can go wrong. From the 8th week until birth, the organism is called a fetus. When the internal organs and the structures actually connect with each other and form a coherent system. All of the neurons you ever produced is now exist. Majority are made in this period (towards the end of this period) myelination. This is why the fetus flips upside down.
