PSYC 2110 Chapter Notes - Chapter 4: Amniotic Sac, Umbilical Cord, Fallopian Tube

• School: York University
• Department: Psychology
• Course: PSYC 2110
• Professor: Scott Adler

Document Summary

We have the gametes produced by meiosis, each with half of the required genetic material. Conception - egg and sperm come together to produce a single cell or zygote that has all of the genetic material (23 pairs of chromosomes) Stage 1: zygote a fertilized ovum (conception ends about 2weeks after fertalization) Zygote fertilized egg receives 23 chromosomes from each parent. Travels down the fallopian tubes and implants in uterus. Cells begin to differentiate and specialize into the cells that will be the embryo and those that will support the embryo (e. g. amniotic sac, umbilical cord) Most vulnerable to threats from both internal and external. All major internal and external structures form. Three layers of cells two layers form first: endodermal - internal organs, ectodermal - nervous system, eyes, ears, skin, mesodermal - muscles, cartilage, sex organs, heart, bones, heart appears between the above two. Differentiation of limbs in week 6 and 7.