CSF is produced by the choroid plexus in the ventricles and the produced CSF flows out from the ventricles and enters the subarachnoidal space through foramina aroud the cerebellum, in the case of humans that is (I am not very sure about mice), and after circulating the whole arachnoidal space throughout it is reabsorbed through the arachnoidal granulations into the blood. Therefore, in theory drugs injected into the ventricles would be efficiently delivered to all the regions of the CNS, unless it is very sticky.
Considering drugs in the CSF is eventually absorbed along with the CSF and reaches the systemic circulation, I wonder how significant it is that a small amount of the drug might leak and enter the systemic circulation at the point of injection.
But, I am not very sure about this.
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