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Andrea

Embriologia

QuestionAnswer
Que ocurre en la fase de Fecundacion? formacion de Cigoto
Segmentacion es? Divisiones mitóticas que producen un incremento del número de las células (blastómeras) que constituyen la MORULA
Fase de blástula se implanta en el útero hacia sexto día
Gastrulación :Es el proceso por el cual se forman las 3 hojas germinativas Ectodermo, Endodermo, Mesodermo
Neurulación se da a partir de que hoja ectodermo
Neurulación da origen a Placa, surco y pliegues neurales y Tubo neural
Plegamiento cefalocaudal. El endodermo cubre la superficie ventral del embrión
Plegamiento cefalocaudal constituye el techo del saco vitelino.
Plegamiento transversal. El endodermo constituye el intestino primitivo. La región abdominal ventral queda adherida al pedículo del saco vitelino.
Ectodermoda da origen a: SNC, SNP, epitelio sensorial de nariz ojos y oido; piel y anejos, hipófisis, mama, esmalte dentario
Mesodermo da origen a: músculos, hueso, cartílago, sistema vascular, urogenital, bazo, suprarrenal
Endodermo: epitelio respiratorio, amígdalas, tiroides, paratiroides, timo, hígado, páncreas, epitelio de la cavidad timpánica
SOMITAS bloques a los lados del tubo neural
Esclerotoma (4a semana) dará lugar a: fibroblastos, osteoblastos y condroblastos
Dermiotoma o dermotomo dará lugar a: la dermis y tj subcutáneo de los tej internos y el tracto gastrointestinal
El hueso se forma por 2 mecanismos Osificación membranosa y Osificación endocondral
Osificación membranosa Hueso directo
Osificación endocondral Cartílago y hueso
Arcos branquiales abultamientos en las caras laterales del embrión, Estos aparecen entre la 4a-5a semana del desarrollo intrauterino.
SURCOS O HENDIDURAS branquiales. separados por fuera, pequeñas hendiduras
Bolsas faringeas lado interno de la pared faríngea se hallan pequeñas evaginaciones del intestino primitivo, separan cada uno de los arcos branquiales por dentro.
Created by: user-1743745
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