Word: choroid
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Ventriculoscope. Buried in the middle of the brain are four ventricles or water reservoirs, the two largest shaped like a pair of ram's horns. Each ventricle is partly lined with feathery tissue called the choroid plexus. Function of the choroid plexus is to generate the fluid which bathes the outside of the brain and spinal cord. If the choroid plexus produces abnormal quantities of water, or if the brain fails to absorb the fluid which bathes it, hydrocephalus occurs...
Practically all efforts to attack paresis hitherto have been frustrated because antisyphilitic drugs, usually mercury or arsenic compounds, cannot pass through the choroid plexus, a sort of fine filter at the base of the brain. The germs which reach the higher centers are free to develop and soon do permanent damage to the brain tissue...