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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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