In the past access to the fourth ventricle was obtained by splitting the vermis or removing part of the cerebellum. The purpose of this study was to examine the access to the fourth ventricle achieved by opening the tela choroidea and inferior medullary velum the two thin sheets of tissue that form the lower half of the roof of the fourth ventricle without incising or removing part. During development pressure from exterior structures causes a number of concave bulges to form within the lateral ventricles which can be extremely variable in their degree of development.
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