FLOW OF CEREBROSPINAL FLUID
1. Cerebrospinal fluid, or CSF, is produced by the choroid plexus in the lateral ventricles of the brain. From the lateral ventricles the CSF flows through the interventricular foramina to enter the third ventricle.
2, Here, a second choroid plexus produces more CSF.
3. Next, the CSF passes through the mesencephalic aqueduct of the midbrain, and into the fourth ventricle, where further CSF is added by a third choroid plexus. From here, it passes through the median aperture and lateral apertures into the subarachnoid space.
4. Finally, the CSF circulates down the central canal of the spinal cord and around the brain and spinal cord in the subarachnoid space.
CSF is reabsorbed into dural blood through arachnoid villi; small projections of arachnoid mater which protrude into the dural venous sinuses, particularly the superior sagittal sinus. Pressure of CSF is kept constant by the rate of its formation equaling the rate of its absorption.
CSF functions as a protective barrier a
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