10. Embryology Ovary 2010

10. Embryology Ovary 2010 - frequent Folliculogenesis :...

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Embryology of the Ovary Biology of Reproduction ZOO 4926 Spring 2008
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Outline 1. Origin and migration of primordial germ cells 2. Formation of basic gonad architecture 3. Proliferation of oogonia and formation of syncytium 4. Oogenesis and Folliculogenesis
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Red = origin of primordial germ cells in multiple species Origin and migration of primordial germ cells (similar in almost all animals) 3-week human 4-week human
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Female Male Formation of basic gonad architecture 1. Germ cells 2. Somatic gonad derived cells 3. Mesonephros derived cells
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8 week human 7 week human Medulla : inner part Cortex : outermost layer
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16-20 week human 20-24 week human
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4 month human Proliferation of oogonia and formation of syncytium Syncytium : a large cell-like structure filled with cytoplasm containing many nuclei. Cytokinesis : the process whereby the cytoplasm of a single cell is divided to spawn two daughter cells
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Meiotic prophase I
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http://embryology.med.unsw.edu.a u/Notes/images/week1/ovary/oocy tenumber.jpg Programmed germ cell death is normal and
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Unformatted text preview: frequent Folliculogenesis : maturation of a ovarian follicle Oogenesis : creation and differentiation of an ovum Embryonic development Embryonic development Meiotic prophase I Meiotic Prophase I Leptotene : Chromosomes condense and homologs begin to align, Zygotene : Full homologous chromosomes alignment, “synapsis” forming “tetrads” (4N) Pachytene : Crossing over occurs, though not visible Diplotene : Homologous chromosomes pull apart, but stay connected a chiasmata •Diapause arrest of meiosis until puberty •However, mRNA is synthesized and stored Interphase : DNA replication 2N->4N Formation of sister chromatids www.answers.com/topic/meiosis Cyst Breakdown, Follicle Formation & Recombination Cyst Breakdown, Follicle Formation & Recombination Chiasmata: Visual evidence of crossing-over, genetic recombination Lampbrush Chromosome: “Open” DNA structure overtly transcribing mRNA in a diapause oocyte...
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This note was uploaded on 05/19/2011 for the course ZOO 4926 taught by Professor Staff during the Summer '08 term at University of Florida.

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10. Embryology Ovary 2010 - frequent Folliculogenesis :...

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