PSYC 160 Lecture Notes - Lecture 1: Prenatal Development, Umbilical Cord, Endoderm
Document Summary
Germinal: takes place in the rst 2 weeks after conception. Includes creation of zygote and continued cell division. Ends with implantation - attachment of zygote to uterine wall (10 days after conception) Support systems for cells form and organs begin development. Before women know they are pregnant, every major organ has begun development. Fetal: following the 2nd month after conception, last for 7-months on average. Surviving outside the womb - 25 weeks of age (need assistance in breathing, lungs not developed). Pre-mature babies are at risk for developmental problems. More than 90% of pre-mature babies are likely to survive. Average baby weights 7. 5 lbs, 20inches in length. By the 2nd week, following conception, central nervous system and heart begin development. 4th and 5th week - eye, limbs, eyes, teeth, external genitalia form. Fertilization: the process by which a sperm and an ovum - the male and female gametes, respectively - join to form a single cell.
