Page "Cerebrospinal fluid" Paragraph 16

It had been thought that CSF returns to the vascular system by entering the dural venous sinuses via the arachnoid granulations ( or villi ).

However, some have suggested that CSF flow along the cranial nerves and spinal nerve roots allow it into the lymphatic channels ; this flow may play a substantial role in CSF reabsorbtion, in particular in the neonate, in which arachnoid granulations are sparsely distributed.

The flow of CSF to the nasal submucosal lymphatic channels through the cribriform plate seems to be especially important.