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EMBRIOLOGÍA DEL APARATO DIGESTIVO
Dr. Edward OcampoAnduaga
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ORIGEN
Endodermo
El tejido muscular , el conectivo y elper itoneo visceral de la pared deltubo
La mayor par te del epitelio derevestimiento y de las glándulasdel tubo digestivo
Hoja esplácnica delmesoder mo later al
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DESARROLLO DEL MESODERMO
EndodermoMesodermo
Ectodermo
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DESARROLLO DEL MESODERMO
Mesodermo Somático
Mesodermo Esplácnico
Celoma Extraembrionario
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Notocorda
Placa Neural
Alantoides
Primordio Cardiaco
Islotes sanguíneos
Nódulo PrimitivoVellosidades Coriales
Embrión de 16 días
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Embrión de 18 días
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22 días
Final de 4° Semana
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24 días 28 díasCorte Sagital del Embrión
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Final de la4 semana
Corte Transversal del Embrión
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5ta Semana
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hipófisis
5°Semana
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Aorta dorsal
TroncoCeliaco
A. Mesentérica Superior
A. Mesentérica Inferior
Irrigación arterial del intestino
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Intestino Medio
Intestino Anterior
Intestino PosteriorCloaca
DDiivveerrttííccuulloo llaarriinnggoo ttrraaqquueeaall
EEssbboozzoo hheeppááttiiccoo
YYeemmaa PPaannccrreeááttiiccaa DDoorrssaall
MMeemmbbrraannaa ccllooaaccaall
MMeemmbbrraannaa bbuuccooffaarríínnggeeaa
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10 semana•Retrocede y rota otros 180º•Colon ascendente y descendente se hacen secundariamenteretroperitoneales
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DESARROLLO DEL ESTÓ MAGO
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Rotación 90°
CurvaturaMenor
CurvaturaMayor
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Mesenterios Dorsal y VentralPrimitivos
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4°Semana 5° Semana
Desarrollo del Esófago
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7° Semana8° Semana
Histogénesis del Esófago
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34° Semana12° Semana
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El epitelio prolifera y oblitera la luz parcial o totalmente,pero normalmente el esófago se recanaliza al final de la
octava semana.
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Malformaciones del Esófago
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Derivados del Intestino Primitivo
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A partir de los esbozos endodérmicos del duodenose desarrollan las glándulas anexas digestivas
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Desarrollo de los Primordios hepático y pancreático
5° Semana 6° Semana
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7°Semana Al final de la etapa Fetal
Desarrollo de los Primordios hepático y pancreático
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Páncreas Anular
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Recanalización Intestinal
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6ª semana: Proliferación endodérmica
8ª semana: Recanalización
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División de la Cloaca por el Seno Urorrectal
5°Semana
6° Semana
8°Semana
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Canal anorrectal
- 2/3 sup. Porción distal delintestino posterior
- 1/3 inf. Fosa anal ectodérmica(Proctodeo)
8ª semana
Se abre la membrana anal
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