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The chick embryo and its chorioallantoic membrane. (A) Schematic drawing of the general structure of a 5 day old chick embryo in the egg and the three-tissue layers of the chick chorioallantoic membrane (CAM). (B) Semithin section of the CAM of a 12 day old chick embryo showing the chorionic epithelium (ch), the vascularized mesoderm (m), and the allantoic epithelium (al). (C) 5 day old chick embryo photographed in ovo [(B,C), reproduced from (75)].
