Alantoides
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El alantoides es una membrana extraembrionaria, originada como una extensión o evaginación del tubo digestivo primitivo del endodermo del embrión de reptiles, aves y mamíferos, situado caudalmente al saco vitelino.
Inicialmente el alantoides circula al embrión entre el amnios y el corion.
Conforme avanza el desarrollo embrionario va disminuyendo de tamaño
transformándose en un saco alargado originado en el tallo del cuerpo del embrión y formar parte del cordón
umbilical.
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Varón de 3 meses Mujer adulta
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La porcion intraembrionaria de la alantoides discurre
desde el ombligo hasta la vejiga urinaria, con la que se
continua. Conforme aumenta la vejiga de tamano, la
alantoides involuciona formando un grueso tubo, el
uraco. Despues de nacer, el uraco se transforma en un
cordon fibroso, el ligamento umbilical medio, que se
extiende desde el vertice de la vejiga urinaria hasta el
ombligo.
Sus vasos sanguineos persisten como la vena y las
arterias umbilicales
Se forma sangre en su pared durante la tercera a la
quinta semana
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Quistes
AlantoidesOnfalocele
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1 de cada 85
gestaciones
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gestaciones
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1 de cada 903
gestaciones
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gestaciones
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