PSYC 2010U Lecture Notes - Lecture 3: Umbilical Cord, Inner Cell Mass, Amniotic Sac
Document Summary
Week 3- parental development & infancy: brain and biological development. Parental development: development that occurs between conception and birth, begins in fallopian tube when sperm penetrates ovum and forms a zygote. Single cell multiplies: takes about 266 days for the one-celled zygote to become a fetus of 200 billion cells, there(cid:859)s (cid:373)ore (cid:272)ells i(cid:374) the fetus tha(cid:374) there is stars i(cid:374) the (cid:373)ilk(cid:455) (cid:449)a(cid:455) Three periods of parental development: germinal period (period of the zygote) Whe(cid:374) z(cid:455)gote is i(cid:373)pla(cid:374)ted i(cid:374) uterus(cid:859) (cid:449)all: period of the embryo. Can start to notice the sex: period of the fetus (only called a fetus in this stage) From 9th week until birth (38 weeks) Massive amount of growth in both size and weight. The germinal period: the first days: cleavage. The mitotic division of the zygote into several cells. Occurs about every 12 hours while the zygote travels down the fallopian tube: zygote travels towards uterus. Divides and forms blastocyst (cells that develop)
