![]() Again, CSF travels through the ventricles, or in other words, the ventricular system provides a pathway for the effective circulation of CSF, so that it can provide protection to the brain.ĬSF is also concerned with the excretion of waste products, such as harmful metabolites or drugs from the brain, besides transporting the hormones to various parts of the brain. The CSF produced in the ventricles acts as a cushion, that protects the brain, by minimizing the impact of any kind of physical trauma. In the brain, the main function of the ventricles is to protect the brain by providing cushioning. But, they do not allow fluid to pass back into the subarachnoid space (of the brain), when the venous pressure is greater than the CSF pressure. The arachnoid villi act as one-way valves, which allow CSF to pass into the bloodstream, when the pressure of CSF is higher than the venous pressure. In the subarachnoid space, CSF is absorbed into the venous blood, by some specialized structures, known as arachnoid villi or arachnoid granulations. Only a small amount of CSF enters the central canal. Foramina of Monro is a narrow, oval-shaped opening, through which CSF flows from the lateral ventricles to the third ventricle.įrom the fourth ventricle, it enters the central canal of the spinal cord and the cisterns of the subarachnoid space, through the median foramen of Magendie and the two lateral foramina of Luschka. The two lateral ventricles are connected to the third ventricle by the interventricular foramen, also known as foramina of Monro. It is a diamond-shaped cavity, that connects with the subarachnoid space through the lateral foramen of Luschka and the median foramen of Magendie. ![]() The fourth ventricle on the other hand, is located posterior to the pons and upper half of the medulla oblongata. The right and left lateral ventricles are located deep within the cerebral hemisphere, just beneath the corpus callosum, while the third ventricle is located in the diencephalon, between the right and left thalamus. The fourth ventricle narrows towards the posterior end of the body and continues with the central canal of the spinal cord. All the ventricles, the lateral, the third, and the fourth ventricle, are joined to one another. All the four ventricles of the human brain develop from the central canal of the embryonic neural tube, usually during the first trimester of pregnancy.
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