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Early Embryogenesis, maternal recognition of pregnancy #, conceptus:…

- - - - mitosis
        
        2 celled embryo
        
        cells called blastomeres
        
        morula (4-8 cells)
        
        early blastocyst
        
        hatching blastocyst
        
        hatched blastocyst: free-floating embryo
        
        2 more items...
        
        enzymes from trophoblastic cells weaken zona pellucida so it eventually ruptures
        
        cells are totipotent: can give rise to complete, fully formed individuals (identical twins)
        
        has distinct cavity
        
        in cow & ewe
        
        secretes interferons
        
        2 more items...
        
        inner & outer cells begin to separate
        
        inner cells form gap junctions among each other
        
        inner cell mass
        
        1 more item...
        
        outer cells form tight junctions among each other
        
        trophoblast
        
        2 more items...
- - - - secreted away from submucosal capillaries, into uterine lumen (exocrine secretion rather than endocrine secretion); no luteolysis