Module 11 prenatal development

Module 11 prenatal development - Human Development and...

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Human Development and Family Studies 362 Development of the Young Child Lecture 11: Prenatal development I. Prenatal development Stages of prenatal development Germinal or zygotic period - lasts about 2 weeks - main function is cell division (so rapid it increases exponentially) - zygote divides into 2 cells, then 4, then 8 and so on -other main function is implantation of the zygote in the uterus Embryonic period - lasts about 6 weeks (weeks 3-8) - amniotic sac- fluid filled, umbilical cord-provides oxygen and nourishment and placenta are present - particularly vulnerable growth period - all body parts and system begin developing -ectoderm=neural tube, skin -mesoderm=muscles, skeletal, and circulatory systems -endoderm= digestive system, lungs, urinary tract - by 8 weeks, embryo is 1 inch long and sensitive to touch Fetal period -lasts from 9 weeks until birth -growth and finishing phase -sex organs begin to take shape -lungs begin to expand II. Prenatal environmental influences Teratogens; environmental agents that cause damage during the prenatal period of development Types of teratogens prescriptions and non prescription drugs, illegal drugs, smoking, drinking, hormones, radiation, pollution Degree of harm depends on -amount and length of exposure, genetic makeup of mother and child, number of teratogens present, timing of exposure,
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This note was uploaded on 12/11/2011 for the course HDFS 362 taught by Professor Professor during the Spring '04 term at Wisconsin.

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Module 11 prenatal development - Human Development and...

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