INTRODUCTION TO VERTEBRATE EMBRYOLOGY

On Certain Problems of Vertebrate Embryology

The author, in these two essays, puts forward a theory to explain certain phenomena which occur in the process of development of vertebrates. The theory is, that there is a hidden alternation of generations?an asexual larval form, succeeded by a sexual one. To the first belong such structures as a yolk-sac, transient nervous system and notochord, which in all vertebrate groups are found to disa...

Approaches and species in the history of vertebrate embryology.

Recent debates about model organisms echo far into the past; taking a longer view adds perspective to present concerns. The major approaches in the history of research on vertebrate embryos have tended to exploit different species, though there are long-term continuities too. Early nineteenth-century embryologists worked on surrogates for humans and began to explore the range of vertebrate embr...

The contribution of chicken embryology to the understanding of vertebrate limb development

The chicken is an excellent model organism for studying vertebrate limb development, mainly because of the ease of manipulating the developing limb in vivo. Classical chicken embryology has provided fate maps and elucidated the cell-cell interactions that specify limb pattern. The first defined chemical that can mimic one of these interactions was discovered by experiments on developing chick l...

Aids to Embryology

An Introduction to Sociolinguistics