Ventricles
the central canal
Central canal
It forms the central canal of the spinal cord and protects the brain from trauma.
The central canal of the spinal cord. The central canal, also known as ependymal canal, is the cerebrospinal fluid-filled space that runs longitudinally through the length of the entire spinal cord.
Combined vertebral foramina forms the spinal canal. The spinal cord of the central nervous system is located within that canal.
Ependymal cells line the central canal of the spinal cord
Ependymal cells
Arachnoid
The ventricles are cavities within the brain that connect with each other, with the subarachnoid space of the meninges and with the central canal of the spinal cord.
The fourth ventricle of the brain lies between the cerebellum and the brain stem. This i next to the third ventricle, which divides the left and right halves of the thalamus.
The ventricular system is a set of structures containing cerebrospinal fluid in the brain. It is continuous with the central canal of the spinal cord.http://en.wikipedia.org/wiki/Ventricular_system
The central canal of the spinal cord runs down the center of spinal cord from top to bottom and allows cerebrospinal fluid to circulate. The part of the spinal cord directly around the central canal is the gray commissure. This is what connects the two halves of the spinal cord and allows signals to travel between the two sides.