Topic10_ANS3319CEarlyEmbryo_MRP_Notes_Final_2011

Topic10_ANS3319CEarlyEmbryo_MRP_Notes_Final_2011 - 117 ANS...

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Unformatted text preview: 117 ANS 3319C Reproductive Physiology and Endocrinology Early Embryo Development Early Embryogenesis & Maternal Recognition of Pregnancy 1) Early developing embryo (Figs13-1 to 13-3) ♦ Ootid: female + male pronuclei • Largest single cell in body ♦ Zygote: single cell embryo that eventually divides ♦ _________________________________________________________________________ • ______________________________________________________________________ ♦ __________________ : > 32 individual blastomeres (unidentifiable) • Inner cells: develop gap junctions & groups of cells form • Outer cells: cell to cell adhesions called tight junctions ♦ Alters permeability of outer cells, fluid accumulation ♦ ____________________: two cell populations • ____________________________________________________________________________ • ____________________________________________________________________________ • Blastocoele: fluid filled cavity ♦ Hatching : blastocyst leaves protective zona • Result of several forces to degenerate zona ♦ Blastocyst growth & fluid accumulation: é pressure ♦ Enzyme production by trophoblastic cells: weakens zona ♦ Blastocyst contraction: intermittent pressure pulses • Post hatching ♦ _________________________________________________________________________ ♦ _________________________________________________________________________...
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Topic10_ANS3319CEarlyEmbryo_MRP_Notes_Final_2011 - 117 ANS...

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