Abstract
Cerebrospinal fluid (CSF) is a clear, colorless ultrafiltrate of plasma located within the ventricles of the brain and the subarachnoid spaces of the cranium and spine. In adults, the mean CSF volume is 150 mL distributed among the ventricles (25 mL) and subarachnoid spaces (125 mL). When compared to plasma, CSF has a higher concentration of sodium, chloride, and magnesium and a lower concentration of potassium and calcium. CSF performs many dynamic functions including protection to the brain and spinal cord, providing nourishment and removal of waste products. CSF is predominantly secreted by the choroid plexuses, which are located within the ventricles of the brain. CSF travels from the lateral ventricles through the interventricular foramina to the third ventricle, through the cerebral aqueduct to the fourth ventricle, and then through the median aperture into the subarachnoid space at the base of the brain. CSF, mainly, leaves the subarachnoid space through arachnoid villi along the superior sagittal venous sinus, intracranial venous sinuses, and around the roots of spinal nerves. Any change in the volume, pressure, and/or composition of the CSF leads to neural malfunction. Despite this historically gold standard classical theory of CSF hydrodynamics, recent studies evolved to postulate that the CSF production and absorption (CSF exchange) are constant and present everywhere in the CSF system.
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Kamel, R., Elbosraty, H., Hafez, M., Kandil, T. (2022). Physiology of CSF. In: AlQahtani, A.A., Castelnuovo, P., Casiano, R., Carrau, R.L. (eds) CSF Rhinorrhea. Springer, Cham. https://doi.org/10.1007/978-3-030-94781-1_2
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