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The ventricular system is a set of four interconnected cavities in the brain, where the cerebrospinal fluid is produced. Within each ventricle is a region of choroid plexus, a network of ependymal cells involved in the production of CSF. The ventricular system is continuous with the central canal of the spinal cord allowing for the flow of CSF to circulate. All of the ventricular system and the central canal of the spinal cord are lined with ependyma, a specialised form of epithelium.
The left ventricle then pumps the oxygen-rich blood through the aorta and into all of the organs and tissues of the body. The right ventricle is located to the right of the left ventricle in the lower portion of the heart. This chamber pumps blood into the lungs through the pulmonary artery. There are four ventricles in the brain, including two lateral ventricles. These ventricles are fluid-filled spaces in the forebrain and brain stem. Cerebrospinal fluid circulates through the brain ventricles after being created in the ventricular system, specifically, the choroid plexus.