ventricular system concept

hydrocephalus ventricle shunt brain cerebrospinal fluid vp surgery cerebral edema nph intracranial enlarged mri skull neurosurgeon pressure disease ventricular system vector interventricular foramen lateral third anatomy csf dura sinus human arachnoid choroid cord granulations mater subarachnoid medical illustration head cortex cerebrum structure central aqueduct canal fourth peritoneal catheter valve collection