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Published byKatrina Dawson Modified over 9 years ago
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1 Ovaries Ovaries Blood supply Blood supply ovarian follicles ovarian follicles Cells around the oocyte are called: Cells around the oocyte are called: Follicle cells Follicle cells Granulosa cells Granulosa cells
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2 Follicles Follicles Primordial follicle Primordial follicle Primary follicle Primary follicle Secondary follicle Secondary follicle Graafian follicle Graafian follicle Ovulation Ovulation Corpus luteum Corpus luteum Oogenesis: Puberty -At puberty, one activated primary oocyte produces two haploid cells -Ovulation -If penetrated by sperm the second oocyte completes meiosis II
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3 Ovarian Cycle ovaries grow and secrete small amounts of estrogens that inhibit the hypothalamic release of GnRH As puberty nears, GnRH is released Monthly Follicular phase Follicular phase Ovulation Ovulation Luteal phase Luteal phase
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Fertilization and Embryonic Development Fertilization = The fusion of two haploid gametes (egg and sperm) n – haploid, 23 chromosomes 2n – diploid, 46 chromosomes 5
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The three stages of Fertilization 1. Penetration 2. Activation 3. Fusion 6
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Early Development 7 Cleavage Implantation Gastrulation
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Gastrulation Ectoderm Ectoderm Endoderm Endoderm Mesoderm Mesoderm 8
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Extra Embryonic Membranes: 1. Yolk Sac 2. Amnion 3. Allantois 4. Chorion 9
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