Cerebrospinal fluid (CSF) is an ultrafiltrate of plasma contained within the ventricles of the brain and the subarachnoid spaces of the cranium and spine. It performs vital functions, including providing nourishment, waste removal, and protection to the brain. Adult CSF volume is estimated to be 150 ml, with a …
What are the 4 functions of CSF?
Cerebrospinal fluid has four major functions: (1) physical support of neural structures, (2) excretion and “sink” action, (3) intracerebral transport, and (4) control of the chemical environment of the central nervous system. Cerebrospinal fluid provides a “water jacket” of physical support and buoyancy.
What are the 5 functions of CSF?
CSF serves five primary purposes: buoyancy, protection, chemical stability, waste removal, and prevention of brain ischemia.
What are the three functions of CSF?
Cerebrospinal fluid has three main functions:
- Protect brain and spinal cord from trauma.
- Supply nutrients to nervous system tissue.
- Remove waste products from cerebral metabolism.
Where is CSF located?
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.
Where does CSF drain?
superior sagittal venous sinus
CSF gets drained into the superior sagittal venous sinus through the arachnoid villi, small protrusions of arachnoid matter into the venous sinus. Physiologically, the pressure of CSF within the subarachnoid space is greater than that within the venous sinus. Hence, the CSF will drain into the venous sinuses.
How does CSF protect the brain?
Protection: the CSF protects the brain from damage by “buffering” the brain. In other words, the CSF acts to cushion a blow to the head and lessen the impact. Buoyancy: because the brain is immersed in fluid, the net weight of the brain is reduced from about 1,400 gm to about 50 gm.
How is CSF maintained?
The choroid plexus mostly synthesizes CSF. Arachnoid granulations are responsible for CSF resorption; they drain CSF into the dural venous sinuses. CSF drains into the lymphatic circulation, via lymph ducts contiguous to the olfactory duct, as it passes through the cribriform plate.