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The Ovarian and Uterine Cycles
Segmentation of Fertilized Ovum
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abdominal alar lamina amnion aorta appears artery aspect attached basal basal lamina becomes beginning body body-stalk body-wall brain bursa capsule cartilage cartilaginous caudal cavity ccelomic cells cerebral vesicle chorion cloaca connection continuous cord cranial dorsal wall ectoderm elongated embryo enlargement epithelial extends fibres floor fold fore-brain fore-gut formation forward front fused genital gland groove growing growth hind-brain hind-gut invagination lamina lateral layer limb liver lower margin mass median membrane mesentery mesoderm mesonephric duct mesonephros mid-brain muscle nasal nerve neural notochord nucleus opening original outer outgrowth ovum paraxial pericardium pharyngeal pharyngeal arches placenta plate posterior pouch primitive primitive streak projection recess region remnant ridge roof round rudiment second month seen septum transversum shown in Fig side sinus somites stage structures surface telencephalon thickening third arch third month tissue tube tubules umbilical upper venous ventral ventricle vessels visceral vitelline vein Wolffian yolk-sac