Living Embryos: An Introduction to the Study of Animal Development |
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8-cell stage adult albumen allantoic amniotic amphibian animal pole appears artery Ascaris become bird blastocoele blastoderm blastodisc blastomeres blastopore blastula blood brain cavity chick chorion coelom coloured Compare Fig cytoplasm derived dermis differentiation division dorsal lip duct Echinoderms ectoderm embryo embryology embryonic membranes endoderm epiblast epidermis epigenetic fate map feather fertilization membrane fish fold frog gastrulation germ layer gill pouches grey crescent groove homolecithal hypoblast larva later lens liver longitudinal mammals melanoblasts mesentery mesoderm micromeres molluscs myotomes Nematodes nerve neural plate neural tube notochord nucleus occur optic cup ovary periblast pigment placode point of sperm Pomatoceros posterior end primitive streak processes produced quartet result seen side sinus skin somatopleure somites species sperm sperm entry spiral cleavage splanchnopleure stomodeum surface tadpole tail telolecithal tissue culture Transverse section transverse septum trochophore usually vegetal vein ventral vertebrates Vertical section vesicles vitelline membrane wall worm yolk sac yolky