Anatomy Block 1.pdf
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FERTILIZATION
Structure of Uterus
Perimetrium
Myometrium
Endometrium
Fimbria
Infundibulum
Isthmus
Ovary
Intramural
Ampulla
Sperm
nucleus Acrosome
Plasma
membrane
of sperm
Enzymes
from the
acrosomeZona
pellucida
Sperm in cytoplasm
of oocyte
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WEEK 1
Polar body
Zona
pellucida
2 cell stage 4 cell stage
Zona
pellucida
Morula8 cell stage
Early blastocyst Later blastocyst
Blastocyst
cavity
Trophoblast
Degeneratingzona pellucida
Inner cell
mass
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WEEK 2
Syncytiotrophoblast
Amnion
Endometrial epitheliumEpiblast
Amniotic
cavity
Exocoelomic
membrane Hypoblast
Cytotrophoblast
Exocoelomic cavity
CytotrophoblastAmnion
Maternalblood in
lacunae
Bilaminarembryonicdi
Extra-embryonic
mesoderm
(Primarymesoderm)
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WEEK 3
f
h
Neuralgroove
Neural plate
Neural fold
Somite(paraxial mesoderm)
Notochord
42 - 44 pairs
SomaticMesoderm
DermatomeMyotome
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WEEK 4
Intra-
embryonic
coelom
Yolk sac
Somatopleure
Neural crest
Notochord
Connecting
stalkHeart
Forebrain
Yolk sac
Notochord Cloacal
membrane
Yolk sac
Lateral fold
Midgut
Developing spinal ganglion
Intraembryoniccoelom
Extraembryonic coelom
Tailfold
HindgutForegut
Midgut
Yolk sac
Yolk stalk
Headfold
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WEEK 5
Epiaxial division
Supplied by
dorsal rami
Hypaxial division
Supplied by ventral rami
Segmental pattern
retained in some
regions
Epiaxial myotome- intrinsic muscles of back
Erector spinae and tranversospinalis
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