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Vertebrate Development

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.

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Vertebrate Development

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  1. Vertebrate Development

  2. Human Oocyte

  3. Fertilization

  4. Fertilization

  5. Fig. 47-3-5 Sperm plasmamembrane Spermnucleus Fertilizationenvelope Acrosomalprocess Basal body(centriole) Actinfilament Spermhead Corticalgranule Fusedplasmamembranes Perivitellinespace Hydrolytic enzymes Acrosome Jelly coat Vitelline layer Sperm-bindingreceptors Egg plasmamembrane EGG CYTOPLASM

  6. Zygote ZonaPellucida Nucleus Cytoplasm

  7. “Implantation” in Placental Mammals Fig. 47-16-1 Endometrialepithelium(uterine lining) Uterus Inner cell mass Trophoblast Blastocoel

  8. “Implantation” in Placental Mammals Fig. 47-16-2 Expandingregion oftrophoblast Maternalbloodvessel Epiblast Hypoblast Trophoblast

  9. Fig. 47-16-3 Expandingregion oftrophoblast Amnioticcavity Epiblast Hypoblast Yolk sac (fromhypoblast) Extraembryonicmesoderm cells(from epiblast) Chorion (fromtrophoblast)

  10. hCGHuman 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.

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