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Vertebrate Development
Human Oocyte
Fertilization
Fertilization
Fig. 47-3-5
Basal body(centriole)
Spermhead
Sperm-bindingreceptors
Acrosome
Jelly coat Vitelline layer
Egg plasmamembrane
Hydrolytic enzymes
Acrosomalprocess
Actinfilament
Spermnucleus
Sperm plasmamembrane
Fusedplasmamembranes
Fertilizationenvelope
Corticalgranule
Perivitellinespace
EGG CYTOPLASM
ZygoteZona Pellucida
Nucleus
Cytoplasm
Fig. 47-16-1
Blastocoel
Trophoblast
Uterus
Endometrialepithelium(uterine lining)
Inner cell mass
“Implantation” in Placental Mammals
Fig. 47-16-2
Trophoblast
Hypoblast
Maternalbloodvessel
Expandingregion oftrophoblast
Epiblast
“Implantation” in Placental Mammals
Fig. 47-16-3
Yolk sac (fromhypoblast)
Hypoblast
Expandingregion oftrophoblast
Amnioticcavity
Epiblast
Extraembryonicmesoderm cells(from epiblast)
Chorion (fromtrophoblast)
hCG Human Chorionic Gonadotropin
• Maintains the corpus luteum so estrogens and progesterone maintain the endometrium.
• Inhibits the ant. Pituitary from releasing FSH and LH, halting the ovarian cycle
• Indicates early pregnancy via early pregnancy tests.