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This volume contains a series of six studies by members of the staff of the Cajal Institute.
The first study, by J. F. Tello, concerns the formation of cranial nerve ganglia and the cephalic mesectoderm of the chicken embryo. The article is illustrated by five beautiful collotype plates. The study was made by the Bielschowsky method in blocks, which shows clearly the earliest differentiations in the placodes and neural crest and their relations to the outlines of the cranial ganglia. The neuroblasts of the ganglia come from the placodes, whether epibranchial or lateral ectodermal. The cells of the neural crest may differentiate into neuroblasts, but their participation in the formation of the cranial ganglia of birds must be very slight. The neural crest disperses its elements within the mesoderm.
Pedro Ramón y Cajal gives a summary of his studies on the brain of batrachians, together with some new findings with
Bailey P. Trabajos del Instituto Cajal de investigaciones biológicas.. Arch NeurPsych. 1950;64(3):488-489. doi:10.1001/archneurpsyc.1950.02310270177014