Figure 2.

Cerebrospinal fluid flow. Cerebrospinal fluid is mainly produced in the lateral ventricles of the brain, while being produced to a smaller extent in the third and fourth ventricles. From the lateral ventricles of the brain, the cerebrospinal fluid flows through Monroe’s foramen into the third ventricle, and it flows from there through the aqueduct of Sylvius into the fourth ventricle, from where it flows through the Magendi’s foramen and two lateral foramina of Luschka into the subarachnoid space of the brain and the spinal cord. Cerebrospinal fluid is mainly absorbed through the arachnoid granulations into the dural venous sinuses and from there into the blood. Arrows shows direction of cerebrospinal fluid flow.