ch 3 - CH 3: PRENATAL DEVELOPMENT, BIRTH, NEWBORN BABY...

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CH 3: PRENATAL DEVELOPMENT, BIRTH, NEWBORN BABY Prenatal Development Conception Egg into fallopian tube 1 day, or 2 days prior Corpus luteum secretes hormones to prepare lining of uterus The period of the zygote Lasts 2 weeks Implantation Blastocyte – hollow, fluid filled ball of 60-70 cells Amnion – membrance that encloses the developing organism Placenta/ umbilical cord Umbilical cord – delivers blood with nutrients Embryonic period of development Week 2 – week 8 Embryonic disk forms 3 layers of cells Embryo very vulnerable (miscarriages) Second month: eyes, ears, nose, jaw, neck Can move – blood flow – heart chambers Liver and spleen take over blood cell production Morning sickness often reported now
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Fetal period of development Week 9 – end of pregnancy (38 weeks) Vernix White cheese-like substance covering baby’s body Protects from ambiotic fluid Lanugo Long hair on baby – helps vernix stick and protect Age of viability (22-26 weeks) Could be born and survive outside womb Rapid growth in size 3 rd month – organs and systems become connected genitals formed (know sex) brain neurons in place can react to stimulus from outside world Environmental influences within the womb Teratogens Dose Heredity Age Sensitive period
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This note was uploaded on 01/04/2012 for the course PSY 231 taught by Professor Limegrover during the Fall '08 term at Miami University.

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ch 3 - CH 3: PRENATAL DEVELOPMENT, BIRTH, NEWBORN BABY...

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