Figure 1. Paths of CSF fluid drainage.

The CSF, flowing between the arachnoid and the pia matter of the meninges, can drain into the blood stream through the arachnoid granulations located along the superior sagittal sinus and the transverse sinuses, or reach the lymphatic vasculature of the nasal mucosa by crossing the cribriform plate, localized under the olfactory bulbs, along the olfactory nerves.