The brain has hollow cavities enclosed in nervous tissue called ventricles. Each cerebral hemisphere has a lateral ventricle and these lead into a central third ventricle via the interventricular foramina. Cerebrospinal fluid (CSF) is produced from blood capillaries called choroid plexuses in the ventricles and this fluid flows slowly through the ventricles. There are choroid plexuses in all of the ventricles of the brain. The CSF from the lateral ventricles flows into the third ventricle. From the third ventricle the CSF flows into the cerebral aqueduct to the fourth ventricle which is located anterior to the cerebellum. From the fourth ventricle, CSF exits to the space between the brain and the skull. CSF cushions the brain from mechanical damage and 'floats' the brain in a fluid medium. The CSF is returned to the cardiovascular system by venous sinuses. Label the ventricles, foramina, and the mesencephalic aqueduct. Color in the spaces after you have labeled them.

Lateral Ventricle

Answer Key: a. Lateral ventricle, b. Third ventricle, c. Cerebral aqueduct, d. Interventricular foramen, e. Fourth ventricle

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