The Segmentation of the Primitive Neural Tube in Chick Embryos (Gallus domesticus): A Morphological, Histochemical and Autoradiographical Investigation

In a study of early neuroblast migration in the mesencephalon and rhomb- encephalon (VAAGE, 1965) it was observed that columns of neuroblasts labelled with tritiated thymidine migrated extensively in the mantle zone. In order to determine the route of migration of the neuroblasts, it was essential to define points to which the columns of neuroblasts could be referred. During the investiga- tion a cellfree zone was observed between the mesencephalic and rhombencephalic mantles, presumably id...