Download - Embryo mammifères
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A-La Segmentation
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MIGRATION TUBAIRE
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Stade 4 Cellules
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Stade 8 Cellules Stade 16 Cellules
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Fluide intercellulaire
blastomère
Jours, dans l’utérus)
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trophoblasteembryoblaste
blastocèle
Blastocyste (début)
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embryoblastetrophoblaste
blastocèle
Blastocyste (stade avancé)
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Un peu après le 5ème Jour
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Sites récepteurs pour l’utérus
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Implantation
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4 .1 Apparition d’un fluide intra- embryonnaire forme-U
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1. 2
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ee
e
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embryoblaste
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hypoblaste
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Remarque: la pré-gastrulation s’achève, les événements embryonnaires sont concomitants
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Hypoblaste squameux
Hypoblaste (cubique)
Cavité amniotique
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Hypoblaste squameux
Hypoblaste (cubique)
Cavité amniotique
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Hypoblaste(entophylle) (C. cubiques)
Hypoblaste squameux
amnioblaste
Épiblaste(éctophylle)
(Lecithocèle 1 ére)
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Disque embryonnaire
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Hypoblaste (cubique)
épiblaste
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cytotrophoblaste
Mésoderme extraembryonnaire
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cytotrophoblaste
Mésoderme extraembryonnaire
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Vésicule vitelline primaire
Extraembryonnaire cœlome
Mésoderme extraembryonnaire Viscéral (splanchnique)
Mésoderme extraembryonnaire somatique
Pédicule de fixation
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Lecithocèle primaire
Extraembryonnaire cœlome
Mésoderme extraembryonnaire Viscéral (splanchnique)
Mésoderme extraembryonnaire somatique
Pédicule de fixation
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Pédicule de fixation
amnios
Reliquat du Lecithocèle 1 ére
Lecithocèle secondaire
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Prolifération de l’épiblaste
Hypoblaste (c. cylindriques)
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Ligne primitive
Plaque prochordale
Zone de la ligne
primitive
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Ligne primitive
Queue (partie caudale)
tête (crâne)
droite
gauche
Zone de la ligne
primitive
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Plaque prochordale
Hypoblaste (cubique)
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Région de la plaque prochordale
(queue)
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Zone de la ligne
primitive
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Coelome
Splanchnopleure
Somatopleure
Villosité primaire
Pédicule
Chorion
Embryon à la fin de la 2èmesemaine
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3- apparition des vaisseaux sanguin l (1er transfert -cordon ombilical)
4 Apparition d’un fluide intra- embryonnaire forme-U
Gastrulation
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Zone de la ligne
primitive
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Ligneprimitive
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Région de la plaque prochordale
(queue)
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Mésoderme intra-
embryonnaireMésoderme
extra-embryonnaire
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ectoderme
amnioblaste
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endoderme
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endoderme
Dépression
primitive
Ligne primitive
Zone de la ligne
primitiveMembrane cloacale
Plaque prochordale (membrane
orophyrngienne)
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Remarque
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Migration du mésoderme intra -embryonnaire
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Mésoderme intra -embryonnaire ectoder
me
endoderme
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Endoderme de la membrane
orophyrngienne
Mésoderme intra -embryonnaire
Mésoderme pré
chordal
notochorde
Endoderme de la membrane
cloacale
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membrane orophyrngienn
e
Dépression primitiveCavité
Amn.Nœud
primitive
membrane cloacale
Mésoderme pré
chordalMésoderme
Intra-embryonnaire
issu de la zone primitive
notochorde
v. vit. sec
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Pédicule de
fixation
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Fin de la troisième semaine
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Diverticule d’allantoïde
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croissance
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notochorde
Mésoderme Intra-embryonnaire
issu de la zone primitive
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Mésoderme Intra-embryonnaire
issu de la zone primitive
notochorde
Endoderme de la plaque pré chordal
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Méso. Intra embryonnaire
Mésenchyme
Meso. Extra embryonnairenotochor
de
Cavité amniotique
Lécithocele sec
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Méso.Para-axial
Méso. intermédiaire
Lame latérale
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Crêtes neurales
gouttière neurales
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Plaque neurale
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croissance
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croissance
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Méso.Para-axialMéso. intermédiaire
Lame latérale
Cavité amniotique
Lécithocele sec
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Méso.Para-axialLame
latérale
notochorde
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Méso.Para-axialLame
latérale
notochorde
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Méso.Para-axialLame
latérale
notochorde
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Remarque : la métamérisation ou somatisation sera traitée dans la 4éme semaine
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4- Apparition d’un fluide intra- embryonnaire en forme-U
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Microgouttelettes du fluide intercellulaire
notochorde
Lame latérale
Cavité amniotique
Lécithocele sec
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Microgouttelettes du fluide intercellulaire
Microgouttelettes du fluide intercellulaire
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Fluide intra-embryonnaire
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Canal droit du fluide intra- embry.
Canal gauche du fluide intra-embry.
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Courbure au front du fluide intra-embryonnaire Cavité amniotique
Crète neurale
notochorde
Zone primitive
Diverticule d’allantoïde
Cavité Vit. Sec.
mésoderme cardiogénique
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Vue en 3D de la paroi du fluide mesothelial
membrane oropharyrngienne
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5- Début de la circulation sanguine avec cordon ombilical
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Tubes cardiaques (18 – 19 jours)
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Lécithocèle II Tubes
cardiaques
Cavité amniotique
Courbure au front du fluide intra-embryonnaire
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Membrane oropharyngienne
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Aorte (gauche)
arc aortique (gauche)
artères ombilicales
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Lécithocèle II
Cavité amniotique
aorteFluide Intra-embryonnaire
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Deux jours après formation des tubes cardiaques
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Lécithocèle II Tube
cardiaque
Cavité amniotique
Courbure au front du fluide intra-embryonnaire
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Un moment après
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Lécithocèle II
Cavité amniotique
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Veine vitelline
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Veine ombilicale
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veine cardinale
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Formation de somites (somatisation ou métamérisation)
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Méso.Para-axialLame
latérale
notochorde
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Remarque : la métamérisation ou somatisation sera traitée dans la 4éme semaine
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Replis neuraux
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Crêtes neuralesTube neural
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Vu en 3D du fluide
membrane oropharyrngienne
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endoderme de la membrane
oropharyrngienne
Canal péricardio- péritonéal(gauche)
Canal péricardio- péritonéal
(droit)
Future péritoine(gauche)
Future péritoine(droit)
notochorde
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Future péritoine(gauche)
Future péritoine(droit)
Canal péricardio- péritonéal(gauche)
Canal péricardio- péritonéal
(droit)
future péricarde
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future péritoine
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future péricarde
Cavité amniotique
Membrane cloacale
Lécithocèle II
Tube cardiaque
Pédicule de fixation
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Tube cardiaque
Cavité amniotique
Pédicule de fixation
Lécithocèle II
Membrane cloacale
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Future péritoine(gauche)
Future péritoine(droit)
Canal péricardio- péritonéal(gauche)
Canal péricardio- péritonéal
(droit)
future péricarde
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future péricarde
Canal péricardio- péritonéal
(droit)
Canal péricardio- péritonéal(gauche)
Future péritoine(droit)
Future péritoine(gauche)
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Cavité amniotique
Lécithocèle II
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V. Vitel.
Canal vitellin
Mb. cloacale
Tube digestif 1ere
Cavité amniotique
Pédicule de fixation
Eminence caudale
(bourgeon caudal)
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V. Vitel.
Canal vitellin
Cavité amniotique
Cordon ombilical
T.D. anter T.D. moy. T.D. post.
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future péricarde
Canal péricardio- péritonéal
(droit)
Canal péricardio- péritonéal(gauche)
Future péritoine(droit)
Future péritoine(gauche)
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Canal péricardio- péritonéal
(droit)
Canal péricardio- péritonéal(gauche)
future péricarde
Future péritoine(droit)
Future péritoine(gauche)
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Tube cardiaque
Cavité amniotique
Pédicule de fixation
Lécithocèle II
Membrane cloacale
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Tube cardiaque
Arc aortique (Gauche)
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Tube cardiaque
Canal péricardi
o- péritonéa
l
Canal péricardi
o- péritonéa
l
future péricarde
T.D antérieur
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