Vertebrate Development

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Vertebrate Development. Human Oocyte. Fertilization. Fertilization. Fig. 47-3-5. Sperm plasma membrane. Sperm nucleus. Fertilization envelope. Acrosomal process. Basal body (centriole). Actin filament. Sperm head. Cortical granule. Fused plasma membranes. Perivitelline space. - PowerPoint PPT Presentation

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Vertebrate Development1Human Oocyte

Fertilization

Fertilization

Fig. 47-3-5Basal body(centriole)SpermheadSperm-bindingreceptorsAcrosomeJelly coatVitelline layerEgg plasmamembraneHydrolytic enzymesAcrosomalprocessActinfilamentSpermnucleusSperm plasmamembraneFusedplasmamembranesFertilizationenvelopeCorticalgranulePerivitellinespaceEGG CYTOPLASM5Figure 47.3 The acrosomal and cortical reactions during sea urchin fertilization

Zygote

Zona PellucidaNucleusCytoplasm

Fig. 47-16-1BlastocoelTrophoblastUterusEndometrialepithelium(uterine lining)Inner cell massImplantation in Placental Mammals

Fig. 47-16-2TrophoblastHypoblastMaternalbloodvesselExpandingregion oftrophoblastEpiblastImplantation in Placental Mammals9Figure 47.16 Four stages in early embryonic development of a human

Fig. 47-16-3Yolk sac (fromhypoblast)HypoblastExpandingregion oftrophoblastAmnioticcavityEpiblastExtraembryonicmesoderm cells(from epiblast)Chorion (fromtrophoblast)10Figure 47.16 Four stages in early embryonic development of a humanhCG Human Chorionic GonadotropinMaintains 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.