3a21 3a22

apical cell — ectoderm ectoderm ectoderm accessory trochoblast primary trochoblast ectoderm secondary trochoblast secondary trochoblast ectoderm ectoderm ectoderm stomodaeum stomodaeum, ectomesoderm endoderm

B as A, except that there is no ectomesoderm from the B-quadrant and that the ectomesoderm originates C from 3c21 in the C-quadrant

11d1 id1"

2d apical cell ectoderm ectoderm primary trochoblast

2d111 ectoderm

2d112 somatoblast

2d2 2d2212 2d22

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