The convoluted surface/cortex of the cerebral hemisphere is demarcated into anatomical regions by prominent sulci or fissures. The central sulcus (Rolando) separates the frontal from the parietal lobe and the lateral fissure (Sylvius) separates the frontal and parietal regions from the temporal lobe. The parietal-occipital fissure, seen most prominently on the medial surface of the hemisphere, is the boundary of the occipital lobe.
There are four communicating ventricles within the brain, paired lateral ventricles, a central flat third ventricle, and the trapezoidal fourth ventricle in the brain stem. Choroid plexuses within the ventricles produce cerebrospinal fluid. The CSF (normal vol. ~20cc) passes from the foramina of the fourth ventricle (Luschka and Magendie) into the subarachnoid (the middle membrane covering the brain) space and is reabsorbed into the dural venous sinuses.
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