THE ORIGIN O F THE OTIC AND OPTIC PRIMORDIA I N MAN G. W. BARTELMEZ Department of Anatomy, The University of Chicago, and the Laboratory of Embryology, Carnegie Institution of Washington TEN FIGURES INTRODUCTION The early history of the nervous system in man and in the great majority of other mammals is but imperfectly known. In the whole order there is only a, single detailed study of the origin of the cranial ganglia. The data on this phase of human development are for the most part included in descriptions of single specimens; they are few and incomplete and marred by faulty interpretations due to the lack of a human series and neglect of comparative material from other forms. We shall here confine our attention to the otic and optic primordia, although the identification of them in the various embryos of the series is based in part upon our interpretation of the primary subdivisions of the nervous system. This evidence will be presented in a subsequent paper. MATERIAL The present observations are based upon the study of complete serial sections of twelve normal embryos ranging between stages of three and sixteen somites. In addition, the data from the published
The Journal of Comparative Neurology – Wiley
Published: Apr 1, 1922
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