Answer:
Cerebral ventricles.
Step-by-step explanation:
A cerebral ventricle is a part of the brain that is divided into 4 anatomic cavities and it is where the cerebrospinal fluid (CSF) is produced.
This ventricles are connected to the central canal of the spinal cord from the fourth ventricle, and this allows the flow of cerebrospinal fluid to circulate all over the brain.