<P> There is about 125 - 150 mL of CSF at any one time . This CSF circulates within the ventricular system of the brain . The ventricles are a series of cavities filled with CSF . The majority of CSF is produced from within the two lateral ventricles . From here , CSF passes through the interventricular foramina to the third ventricle , then the cerebral aqueduct to the fourth ventricle . From the fourth ventricle , the fluid passes into the subarachnoid space through four openings -- the central canal of the spinal cord , the median aperture , and the two lateral apertures . CSF is present within the subarachnoid space , which covers the brain , spinal cord , and stretches below the end of the spinal cord to the sacrum . There is a connection from the subarachnoid space to the bony labyrinth of the inner ear making the cerebrospinal fluid continuous with the perilymph in 93 % of people . </P>
<P> There is about 125 - 150 mL of CSF at any one time . This CSF circulates within the ventricular system of the brain . The ventricles are a series of cavities filled with CSF . The majority of CSF is produced from within the two lateral ventricles . From here , CSF passes through the interventricular foramina to the third ventricle , then the cerebral aqueduct to the fourth ventricle . From the fourth ventricle , the fluid passes into the subarachnoid space through four openings -- the central canal of the spinal cord , the median aperture , and the two lateral apertures . CSF is present within the subarachnoid space , which covers the brain , spinal cord , and stretches below the end of the spinal cord to the sacrum . There is a connection from the subarachnoid space to the bony labyrinth of the inner ear making the cerebrospinal fluid continuous with the perilymph in 93 % of people . </P>
where is most of the cerebrospinal fluid found
where is most of the cerebrospinal fluid found
the ventricular system of the brain
the ventricular system of the brain