Ventricles of the brain
The ventricles of the brain are a group of four cavities and two canals that are filled with CSF. The CSF follows the ventricles through the cavities and canals from the cerebral hemisphere to subarachnoid spaces of the brain and even down through the spinal cord.
Cerebrospinal Fluid:
Cerebrospinal fluid, or CSF for short, is a fluid that surrounds the brain and spinal cord. CSF acts as a cushioning for the brain and spine to protect it from blunt trauma. It also transfers nutrients to the nervous tissues and removes wastes while providing a chemically stable environment. CSF consists of mostly blood and water contents .
Choroid Plexus:
The choroid plexus is located all around the walls of the lateral ventricles and plays a very important part in the cerebral ventricles system. The choroid plexus has ependymal cells located in it and it produces more that 2/3 of the body's CSF.
Ventricles Cycle:
The flow of CSF first starts in the lateral ventricles that are located in the cerebral hemisphere. The CSF then enters the third ventricle located directly below the lateral ventricles by means of the interventricular foramen that is connected to both lateral ventricles. The CSF then uses the cerebral aqueduct to move from the third ventricle to the fourth. The fluid then either flows through the central canal of the spinal cord down to the spinal cord, or exits the fourth ventricle into the subarachnoid spaces in the brain.