ANS3319CEarlyEmbryo_MRP_Key_Final_Topic12 - ANS 3319C...

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ANS 3319C Reproductive Physiology and Endocrinology Early Embryo Development 116 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 Cleavage: cell # w/o cell mass (mitosis) forms bastomeres Totipotent cells: form identical individuals (2 to 16 cells) Morula : > 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 Blastocyst : two cell populations Inner cell mass embryo proper Trophoblast chorion (outer placental layer) Blastocoele: fluid filled cavity Hatching : blastocyst leaves protective zona Result of several forces to degenerate zona Blastocyst growth & fluid accumulation: pressure Enzyme production by trophoblastic cells: weakens zona Blastocyst contraction: intermittent pressure pulses Post hatching Blastocyst free floating in uterus Dependent on uterine environment for survival
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This note was uploaded on 07/16/2011 for the course ANS 3319 C taught by Professor Yelich during the Spring '11 term at University of Florida.

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ANS3319CEarlyEmbryo_MRP_Key_Final_Topic12 - ANS 3319C...

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