Chapter_3 - PRENATAL DEVELOPMENT AND BIRTH Chapter 3...

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Unformatted text preview: PRENATAL DEVELOPMENT AND BIRTH Chapter 3 Prenatal Development Germinal period- first two weeks after conception Creation of fertilized egg-zygote Attachment to uterine wall Blastocyst Cells that will later become embryo Trophoblast Cells that later develop to form nutrition for embryo Embryonic Period 2-8 weeks Organs appear 3 layers of embryo Endoderm (inner layer of cells) Ectoderm (outer most layer of cells) Mesoderm (middle layer) Embryonic Period 21 days Spinal cord forms Eyes appear 24 days Cells for heart differentiate 4 th week Arm and legs Four heart chambers begin Blood vessels 5-8 weeks Face starts to form Intestinal tract Fetal Period 2-9 months Growth and development continue 3 months 3 inches long 1 ounce Moves body parts Facial features are distinguishable Sex can be identified 4 months 6 inches 4-7 ounces Fetal Period 5 th month 12 inches 1 pound 6 th month 14 inches 1.5-2 pounds Eyes and eyelids complete Hair Grasping reflex Fetal Period 7 th-9th month Viable Fatty tissue Organ systems finish developing Weight and length grow Birth Average baby 7.5 pounds 20 inches Low Birth Weight and Preterm...
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This note was uploaded on 09/08/2011 for the course PSY 2301 taught by Professor T during the Spring '11 term at Texas Tech.

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Chapter_3 - PRENATAL DEVELOPMENT AND BIRTH Chapter 3...

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