Final answer:
CSF circulation is drained from the ventricles to the sinuses through arachnoid granulations, which allow CSF to be reabsorbed into the venous blood.
Step-by-step explanation:
The circulation of cerebrospinal fluid (CSF) from the ventricles to the sinuses is mainly facilitated by arachnoid granulations. CSF is produced by the choroid plexus within the ventricles and flows through the ventricular system. Eventually, it enters the subarachnoid space through the median and lateral apertures. In the subarachnoid space, CSF performs vital functions, including the removal of metabolic wastes from the CNS and acting as a cushion for the brain and spinal cord. The crucial process of CSF reabsorption into the venous blood occurs at the arachnoid granulations, where the CSF is filtered back into the dural sinuses. From there, the blood journey continues towards the heart.