QUANTITATIVE DEVELOPMENT of CHOROID PLEXUSES IN CHICK EMBRYO CEREBRAL VENTRICLES

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Abstract
Using planary projection from the time the plexuses reached a consistent flattened structure, the choroid plexuses in the lateral cerebral ventricles were studied from day 6, the plexus in the 3rd cerebral ventricle from day 8, and the plexus in the 4th cerebral ventricle from day 11 of incubation. Regardless of the microscopic origin of these choroid plexuses, their development reached a growth maximum on day 15 of incubation, after which there was a slight regression. The regression was gradual in the plexus of the 3rd cerebral ventricle but a transient enlargement of plexuses in the lateral and in the 4th cerebral ventricle was observed between days 18-19. The enlargement of choroid plexuses in the lateral cerebral ventricles was caused by a flattening of the villi, while that of the plexus in the 4th cerebral ventricle was caused by thinning and yawning of the villi. The area of choroid plexuses in the lateral cerebral ventricles was 6 or 7 times larger than the sum of the areas of the remaining choroid plexuses.