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This text offers treatment of the molecular, cellular, and developmental cellular biology of amphibians - a synthesis of classical embryology and modern molecular biology that moves the discipline from taxonomy to the centre stage of contemporary biological research. Here, the origin, development, and differentiation of a wide range of amphibian organ systems from the fertilized egg to the completion of metamorphosis are reviewed in depth. Clearly emerging notions about the biology of cellular differentiation - a problem at the heart of biology today - are shown not only to be fundamental to the amphibia, but also generally extendable to all vetebrate groups.Coverage and features of the book include: the origin of amphibians; endocrine mechanisms of metamorphosis, principles of amphibian staging; comprehensive tables of staged specimens; the thyroid, pituitary, and hypothalamus; skeletogeny and its hormonal control; development of the musculature; development of the CNS; developmental biology of each organ system; induction phenomena; principles of cellular diversity; differentiation from fertilization through morphogenesis; molecular biology of cellular differentiation; receptors and differentiation; hormone-target response; and electron microscopy.
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This book came about as a result of a review I had written earlier on fea tures of cellular changes occurring during anuran metamorphosis. Only a limited treatment of this subject was possible in such a circumscribed work and only specific examples of organic change were dealt with. Thus the sins of omission weighed heavily, for so much information could not be included to provide a more comprehensive and authenticated account of the elaborate, complex, and far-reaching changes that an aquatic larva undergoes to become a terrestrial froglet. A good deal of my working life has been spent investigating amphib ians, especially their larval developmental morphology during metamor phosis, first at the level of light microscopy and in later years by electronmicroscopy. Initially I was particularly concerned with morpho logical homologies of a variety of larval structures, such as the cranial and pharyngeal skeleton and the nerves and musculature, in order to learn more about amphibian phylogeny, for during my pre-and early postgrad uate years G. R. Beer and D. M. S. Watson inspired an undying interest in and respect for vertebrate comparative anatomy. However, it now seems to be that amphibian phylogenetic relationships are best dealt with by the paleontologists, so ably demonstrated by D. M. S. Watson and A. S. Romer and the contemporary enthusiasts in this field like A. L. Panchen, R. L. Carroll, E. Jarvik, and K. S. Thompson among a host of others, particularly in the USA.