PSY210H5 Chapter Notes - Chapter 3: Low Birth Weight, Preterm Birth, Fetal Alcohol Spectrum Disorder
Document Summary
Ovum, once released from ovaries, lives 3-5 days. Zygote begins a physiological dependence with the mother. Conception takes place during or within a few days of woman"s ovulation: the zygote. The developing organism from the time the sperm and egg unite to 2nd week of gestation. Proceeds down mother"s fallopian tube and implants in wall of uterus: the embryo. Differentiation of the major physiological structures and systems. Period of rapid growth (beginning of the third week) Crucial structures develop to protect and support growth. Inner mass of developing embryo differentiates into three layers. The rapid growth and differentiation make the developing fetus make the embryo particularly susceptible to environment assault. Head begins to take shape, followed by eyes and mouth. Blood vessels that will become the heart being to pulsate. Spinal cord and membranes that protect it may protrude from the spinal column. Buds that will form arms and legs appear.
