Anatomy

Anatomy - Term Definition Embryology study of the origin...

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Term: Embryology Definition: study of the origin and development of single individual Term: Prenatal period Definition: Embryonic period- first 8 weeks Fetal period- remaining 30 weeks Term: Embryonic period Definition: Duration: first 8 weeks post fertilization Major events: organs form from three primary germ layers. The basic body plan emerges. Term: Fetal period Definition: Duration: weeks 9-38 after conception Major fetal events: organs frow in size and complexity
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Term: Embryonic period- week 1 Definition: -from zygote to blastocyst -conception: in lateral third of uterine tube -zygote (fertilized oocyte) moves toward the uterus -blastomeres: daughter cells formed from zygote -morula: cluster of 12-16 blastomeres -blastocyst: fluid filled structure, about 60 cells -cleavage: cell division without growth Term: Week 2 - the two layered embryo Definition: -Bilaminar embryonic disc: inner cell mass divided into two sheets. --Epiblast and the hypoblast, together make up the bilaminar embryonic disc -Amniotic sac: formed by an extension of epiblast -- Outer membrane: forms the amnion -- Inner: forms the amniotic sac cavity, filled with amniotic fluid -Yolk sac: formed by an extension of hypoblast --Digestive tube forms from yolk sac
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Term: Week 3 - the three layered embryo Definition: -Primative streak: epiblast cells
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