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embryologie du SN
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Résumé explicatif ; emplacement) :para_axial\intermidiaire \ lateral
Embryologie du SN :
Histophysiologie (le rôle) :
SNP → reçoit et transporte
l’information chaque groupe developpe un
SNC(Nevrax) →traitement \ organe \ un système et le
traduction de l’info paraaxial a leffet sur le
developpement du SN
Histologie ( constitution
cellulaire ) : →L’induction neurale:
Deux types de cellules : C la sécrétion des substances
Neurones : precieuses ( car ( protéines \hormones ,,) définies
sa lésion est irréversible ) génétiquement a partir du
Nevroglie :tissu de soutien mésoblaste para axial a
l’ectoblaste , et cela donne :
Embryologie :
Plaque neurale \ crête neurale \
Origine : ectoblaste
Datation : 17 eme jr (trés plocodes neurales
tot) 21eme jr :
ETAPES : →Plaque neurale : presente
deux invaginations limitants entre
17eme jr :
eux un vide , et ça donne : deux
→Gastrulation : gouttieres et deux bourrelets
neurales
C la formation des feuillets
(didermique →tridermique ), par -Entre une gouttiere et un bourrelet :
l’ajout d’un feuillet intermédiaire les cellules de la crete neurale
mesoblastique 28eme jr :
Changement de nomenclature :
→fermeture du tube neural :
epiblaste→ectoblaste(dorsal) les cellules dans les bords des
deux gouttières se fissionnent
hypoblaste→ento\
( grâce a la reconnaissance entre
endoblaste(ventral)
les cellules ) , la partie
→Proliferation\ crânienne(29emejr) se ferme
differenciation : avant la caudale (30emejr)
Les cellules mesoblastiques se →les cellules de la crête
proliferent + s’evoluent et neurale :
organisent (3)groupes(selonleurs
La delamination :
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