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Schematic diagram of the differentiation of vesicles in the developing brain. The three stages in the development of the vesicles within the brain as changes in differential growth and proportions of the forebrain, mid brain and hindbrain (1st and 2nd stages) are modified by flexures that still allow the continuity of the CSF channels within. Stage 3 illustrates the formation of cerebellum and its relationship with the fourth ventricle and the cerebral aqueduct.
