![]() ![]() The CSF then passes through the arachnoid villi into the superior sagittal sinus, a large vein, and is absorbed into the bloodstream. It has traditionally been thought that CSF is absorbed through tiny, specialized cell clusters called arachnoid villi near the top and midline of the brain. This is often referred to as non-communicating hydrocephalus. If the flow of CSF at any of these points is blocked, hydrocephalus can develop. From the fourth ventricle, it passes through three small openings called foramina and into the subarachnoid space surrounding the brain and the spinal cord. From the third ventricle, it flows down another long passageway known as the aqueduct of Sylvius into the fourth ventricle. This can happen when there is a tumor on the choroid plexus, for example.ĬSF flows from the lateral ventricles through two narrow passageways into the third ventricle. In some cases, hydrocephalus can develop when the choroid plexus produces too much CSF. This accumulation of CSF increases the pressure in the brain causing the ventricles to enlarge and the brain to be pressed against the skull.Ĭerebrospinal Fluid is primarily produced within the lateral third ventricles by delicate tufts of specialized tissue called the choroid plexus. Hydrocephalus develops when this balance is altered and is characterized by an abnormal accumulation of CSF within the ventricles. Our bodies produce approximately one pint of CSF every day, continuously replacing it as it is absorbed. Under normal conditions, a delicate balance exists between the amount of CSF produced and the rate at which it is absorbed. CSF cushions the brain and spinal cord against forceful blows distributes important substances and carries away waste products. The ventricles are connected by narrow passageways.Ĭerebrospinal Fluid (CSF) flows through the four ventricles and then flows between the meninges in an area called the subarachnoid space. There are four ventricles in all: two lateral ventricles, the third ventricle, and the fourth ventricle. Ventricles can be thought of as chambers filled with fluid. Between the brain and skull are three other protective coverings called the meninges, which are special membranes that completely surround the brain and spinal cord. The brain and spinal cord form the central nervous system (CNS), and they are surrounded and protected by the bones of the skull and the vertebral column (backbone). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |