Ventricular system
The ventricular system in the brain is composed of CSF-filled ventricles and their connecting foraminae. They are continuous with the central spinal canal.
The interconnections between the ventricles occurs through the following:
- interventricular foramen (of Monro): lateral to third
- cerebral aqueduct (of Sylvius): third to fourth
- median aperture (of Magendie): fourth to cisterna magna
- two lateral apertures (of Luschka): fouth to quadrigeminal cistern
Both the cisterna magna and the cistern of the great cerebral vein are in the subarachnoid space. This space is continuous with the subarachnoid space around the cord down to the level of the cauda equina.

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