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Day 12 -15
- Morulla attaches to uterine wall and becomes chorion
- Inner cell mass differentiates into a 2 layer primitive germ disc (ectoderm/ endoderm)
- Formation of mesoderm
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Day 30
- Formation of embryo
- Somites differinate into 3 layers
- ----- sclerotome
- -----dermatome
- ----- myotome
- development of ventral root of each SN
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Day 60
Embryo becomes fetus
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Neural plate sequence (formation of CNS)
Neural plate --> neural groove --> neural tube --> CNS
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Neurocele
Hole in neurotube that turns into ventricular system
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Prosencephalon
- Forebrain
- (telencephalon- endbrain , diencephalon- between brain)
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rhombencephalon
(metencephalon-pons, myelencephalon- medulla oblongata)
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mesencephalic flexure
prosencephalon grows faster than the rest of the neurotube. The overlying skull cant keep up with it and bends at the point of the midbrain causing the prosencephalon to be perpendicular to the rest of the CNS
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middle mesoderm breaks down into ____________
31 somites, 1 for each SN
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neural crest cells
form the dorsal root ganglia of SN and ganglia of CN 5,7,8,9
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