Production and Circulation of CSF and Related Disorders Quiz

See The Ventricular System. Option E is correct. The ventricles are four connected, fluid-filled chambers in the brain: two lateral ventricles (one in each cerebral hemisphere), the third ventricle in the midline between the two thalami (the paired relay structures deep in the brain), and the fourth ventricle in front of the cerebellum. Each lateral ventricle opens into the third ventricle through its own interventricular foramen, also called the foramen of Monro, a small hole rather than a long tube. Cerebrospinal fluid (CSF) made in the lateral ventricles flows through these holes, then through the cerebral aqueduct into the fourth ventricle, and finally out into the subarachnoid space around the brain. A block at one foramen would make the lateral ventricle behind it swell. Memory aid: follow the fluid downstream, Lateral, Monro, Third, Aqueduct, Fourth, the order in which the chambers and links appear.

• Link: Each lateral ventricle opens into the third ventricle through its own interventricular foramen, the foramen of Monro, a small hole.
• Flow: Lateral ventricle, foramen of Monro, third ventricle, cerebral aqueduct, fourth ventricle.
• Blockage: A block at one foramen makes the lateral ventricle behind it swell.