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Zusammenfassung Embryologie : Carnegie Stadien - erste 8 Wochen
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Zusammenfassung der 12 Carnegie Stadien in der Embryologie
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Carnegie-StadienCarnegie-Stadien Freie Blastocyste
23 Schritte in den 8 ersten Wochen „Hatching“ der
Blastocyste, durch
Auflösen der ZP
Stadium 1 : Befruchtung (1.Tag) Epiblast und
Hypoblast werden
Eindringen in den
gebildet und formen so die zweiblättrige
perivitellen Raum (zw.
Embryonalscheibe.
Zona pellucida und
Oberfläche der Eizelle
Stadium 4 : Implantation (6.Tag)
Syngamie
Verhinderung des Eindringens in die Synzytiotrophoblast
ZP Zytotrophoblast
2. Reifeteilung 2. Polzelle Anlagerung der
Karyogamie (Vorkerne) = Bildung der Blastocyste and die
Zygote Mukosa des Uterus
Anheftung der
Stadium 2 : Zellteilung (2.-3. Tag) Blastocyste an das Endometrium und
Interaktion zw. Embryo + mütt. Gewebe
Furchungsteilungen
der Blastomeren
Stadium 5 : Placenta (7.-13. Tag)
(ab 2- Zellstadium)
Bildung der Stadium 5a (7.-8. Tag)
Blastomeren = ab
12-Zellstadium Entwicklung der
totipotent) zweiblättrigen
Keimscheibe
Kompaktierung: ab 8 bis 16 Zellen
(Morula) Entstehung der
Polarisierung der Blastomeren langsam Amnionhöhle und
des primären
sichtbar
Dottersackes. Blutinseln (11.Tag)
Stadium 3 : Blastocyste (4.-5.Tag) Stadium 5b (9.Tag)
Nach Bildung der Anschluss des SZT
Blastocystenhöhle an mütterliche
= Blastocyste (16- Gefäße
32 Zellen) Lakunärer ZTB und
Segmentierung vollständiges
(Embryoblast,Trophoblast) Eindringes ins
Embryonaler und abembryonaler Pol Endometrium
Definitive Amnionhöhle
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