Embryology (1949) Embryology embryology00bart Year: 1949 PRESUMPTIVE EPIDERMIS PRIMITIVE STREAK DUCK CHICK NEURAL TUBE DUCK NOTOCHORD CHICK NEURAL TUBE CHICK NOTOCHORD Fig. 38. The organizer in the blastoderm of birds. Upper figure shows duck blastoderm. The anterior end of the primitive streak is cut out and transplanted into the presumptive epidermis of the chick blastoderm. Lower figure shows two neural tubes of chick ectoderm, one induced by chick notochord, the other in- duced by the transplanted duck notochord. 81

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