Ventricles of the brain
As mentioned within the subsection "embryonic development", the brain ventricles arise from expansions of the embryonic neural tube. These ventricles are continuous with one another along with the central canal of the spinal cord. These hollow chambers are filled with cerebrospinal fluid and line with ependymal cells, which are a type of neuroglia that circulate this fluid.
The two lateral ventricles, one within each cerebral hemisphere, are large horseshoe-shaped chambers, reflective of the growth pattern of the hemispheres. Towards the front of the brain, the two ventricles lie very close to one another, only separated by a thin middle membrane called the septum pellucidum. Each of these two ventricles communicates with the very narrow third ventricle located in the diencephalon. They communicate via a channel called the interventricular foramen. The third ventricle is then continuous with the fourth ventricle via the canal-like cerebral aqueduct that travels through the midbrain. The fourth ventricle is located in the hindbrain dorsal to the pons and medulla. There are three opening that mark the walls of the fourth ventricle. There are the paired lateral apertures located in its side walls and the median aperture located in its roof. These apertures connect all of the ventricles to the subarachnoid space, which is a fluid-filled space surrounding the brain.
The two lateral ventricles, one within each cerebral hemisphere, are large horseshoe-shaped chambers, reflective of the growth pattern of the hemispheres. Towards the front of the brain, the two ventricles lie very close to one another, only separated by a thin middle membrane called the septum pellucidum. Each of these two ventricles communicates with the very narrow third ventricle located in the diencephalon. They communicate via a channel called the interventricular foramen. The third ventricle is then continuous with the fourth ventricle via the canal-like cerebral aqueduct that travels through the midbrain. The fourth ventricle is located in the hindbrain dorsal to the pons and medulla. There are three opening that mark the walls of the fourth ventricle. There are the paired lateral apertures located in its side walls and the median aperture located in its roof. These apertures connect all of the ventricles to the subarachnoid space, which is a fluid-filled space surrounding the brain.