I. Introduction.- II. Material and Methods.- III. Results.- Day 13 of gestation.- Day 15 of gestation.- Day 17 of gestation.- Days 18 and 19 of gestation.- Days 20 and 21 of gestation.- Third postnatal day.- Seventh postnatal day.- Tenth postnatal day.- Fourteenth postnatal day.- IV. Discussion.- 1. The ventricular zone in its significance for the cell proliferation and the resulting growth of area and thickness of the immature brain.- 2. The histological and cytological differentiation.- 3. Comparison of the development of the four visual centers with regard to their functional integration into the visual system.- V. Summary.- Acknowledgements.- References.

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