Development
The fourth ventricle, similarly to other parts of the ventricular system of the brain, develops from the central canal of the neural tube. Specifically, the fourth ventricle originates from the portion of the tube that is present in the developing rhombencephalon. During the first trimester of pregnancy central canal expands into lateral, third and fourth ventricles, connected by thinner channels. In lateral ventricles specialized areas- choroid plexuses appear, which produce cerebrospinal fluid. If its production is bigger than resorption or its circulation is blocked- the enlargement of the ventricles may appear and cause a hydrocephalus. Fetal lateral ventricles may be diagnosed using linear or planar measurements. See also Dandy-Walker syndrome.
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“For the child whose impulsiveness is indulged, who retains his primitive-discharge mechanisms, is not only an ill-behaved child but a child whose intellectual development is slowed down. No matter how well he is endowed intellectually, if direct action and immediate gratification are the guiding principles of his behavior, there will be less incentive to develop the higher mental processes, to reason, to employ the imagination creatively. . . .”
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