medical notes

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Fetal DevelopmentGrowth and monitoringStages of Fetal GrowthThe Zygote - in fallopian tube, conception to 2weeksThe Embryonic Stage - in placenta, 2 weeksto 2 monthsThe Fetal Stage - in placenta, 3 months to 3842 weeks at birthStages of Fetal GrowthThe Zygote - in fallopian tube, conceptionto 2 weeksThe Embryonic Stage - in placenta, 2weeks to 2 monthsThe Fetal Stage - in placenta, 3 months to38-42 weeks at birth1. The Zygote: Pre-implantation EmbryoEgg fertilized in fallopian tube; Celldivision occurs without increasing cellsize (hyperplasia)Blastocyst (conceptus) forms a singlelayer of cells form hollow sphereInner cell mass becomes fetus andamniotic fluidOuter cell mass becomes trophoblastand placentaEndometriumThe uterine wall where blastocyst implantsBy day 4 the blastocyst or conceptusarrives in uterusBy day 10 implantation occursAt 2w conceptus becomes embryo2. Embryonic StageLasts from 2 weeks to 2 months; babyis 1 1/2 inches long;Period of massive cell differentiationand synthesisInitially cell number doubles every 24hrsEmbryonic layersEctoderm outer layer forms brain,nervous system, hair, skinMesoderm middle layer formsmuscles, internal organs, bones, CVand excretory systemsEndoderm inner layer forms glands,endothelial layer of digestive,respiratory and excretory systemsEmbryonic StageHyperplasia increase in cell numbersHypertrophy increase in cell sizeBoth process

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