Where is CSF reabsorbed back into blood?

1. The structure emerges into a dural sinus. 2. It filters CSF back for drainage. 3. An arachnoid villus emerges into the dural sinus to allow CSF to filter back into the blood. 4. So the answer is arachnoid villi. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 13 'Anatomy of the Nervous System'_