Primordial Germ Cells in the Chordates: Embryogenesis and Phylogenesis |
Contents
Early embryogenesis with special reference to mesoderm | 8 |
The lower chordates | 32 |
The Amniota | 41 |
General conclusions | 52 |
The extragonadal and onetime origin of the primordial | 71 |
Site and mode of origin of the primordial germ cells | 81 |
The formation of the gonadal anlagen | 104 |
The migration of the primordial germ cells | 113 |
Phylogenetic significance of the embryological data presented | 128 |
Concluding remarks and some perspectives for further analysis | 145 |
| 175 | |
| 183 | |
Common terms and phrases
Agnatha Ambystoma amphibians Anat Arch archenteron Biol birds Blackler blastoderm blastodisc blastomeres blastoporal blastula Bounoure Branchiostoma caudal cellules germinales chick embryo Chondrichthyes chordates cleavage cytoplasm displacement dorsal Dubois early development early gastrula ectoderm embryo endoderm epiblast evidence experimental extra-embryonic extra-gonadal Eyal-Giladi Fargeix fishes formed Fujimoto gastrula genital ridges germ cell determination germ cell formation germ line germ ring germinal crescent germinal granules germinal plasm Gipouloux gonadal anlagen gonadal epithelium gonocytes groups Hubert hypoblast inductive invagination l'embryon lateral plate mesoderm layer localisation mammalian mammals marginal zone mesoderm formation migration moiety Morphol mouse neural Nieuwkoop normal notochord number of PGCs observed occurs oocytes Osteichthyes Pasteels PGCs phylogenetic posterior primary hypoblast primitive streak primordial germ cells region reptiles Reverberi segregation somatic cells somites stage structures teleosts tissue totipotent Triturus Tung ultrastructure urodele vascular vegetal pole vegetal yolk mass ventral vertebrates Wilhelm Roux Wolffian ducts Xenopus laevis yolk sac Zool