PSYB20H3 Chapter Notes - Chapter 3: Prenatal Development, Gestation, Fetal Alcohol Spectrum Disorder
Document Summary
Gestation: the prenatal period of development, between conception and birth. Cephalocaudal principle: principle that development proceeds in a head-to-tail direction; that is, upper parts of the body develop before lower parts of the trunk (i. e. , birth, brain, & eyes develop earlier). Proximodistal principle: principle that development proceeds from within-to-without; that is parts of the body near the centre develop before the extremities (i. e. , arms & legs develop before fingers & toes). Germinal stage: the first two weeks of development after fertilization. Embryonic stage: second stage of prenatal development (2-8 weeks), characterized by rapid growth and development of major body systems and organs. Spontaneous abortion: natural expulsion from the uterus of an embryo that cannot survive outside the womb; also called miscarriage . Fetal stage: final stage of prenatal develop (from 8 weeks to birth), characterized by increased differentiation of body parts and greatly enlarged body size.
