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On Early Cell Migration Processes in the Embryonic Brain

Tornblad-Institute for Comparative Embryology, Lund Head: Professor Gösta Glimstedt and the Institute of Anatomy, University of Gothenburg Head: Professor Bo E. Ingelmark

¹ Author's address: Institute of Anatomy, Fjärde Långgatan 7, Gothenburg. Sweden.

Received for publication 23 July 1955.

SUMMARY

During the ontogenesis of the central nervous system, cell migration processes occur. Some of the literature on this subject has been summarized by Hamburger & Levi-Montalcini (1950) and by Bergquist & Källén (1954). When the neural tube is closed its wall is a compact neural epithelium. From it cells migrate lateralwards into a cell-free zone, formed earlier. The migration occurs from restricted areas, the migration areas, lying around proliferation furrows. The migration may take place in successive waves, forming two or more migration layers, the earlier formed lying external to the later formed. This process is called ‘the process of successive migrations’. The migration layers may fuse or split secondarily, forming subdivisions that represent the rudiments of the brain nuclei. The present author (1954) has used these structures as a basis for homologizing the diencephalic nuclei, and Källén (1951) investigated the telencephalic nuclei using the same principle.

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