In the brain, the interventricular foramina (foramina of Monro) are channels that connect the paired lateral ventricles with the third ventricle at the midline of the brain. As channels, they allow cerebrospinal fluid (CSF) produced in the lateral ventricles to reach the third ventricle and then the rest of the brain's ventricular system. The walls of the interventricular foramina also contain choroid plexus, a specialized CSF-producing structure, that is continuous with that of the lateral and third ventricles above and below it.
Structure
The interventricular foramina are two holes (, pl. foramina) that connect the left and the right lateral ventricles to the third ventricle. They are located on the underside near the midline of the lateral ventricles, and join the third ventricle where its roof meets its anterior surface. The lateral ventricles remain connected to the third ventricle throughout development, themselves developing as outpouchings from the third ventricle. and linked to: inflammation and scarring from congenital infections, particularly TORCH infections; developmental abnormalities, including of the basilar artery and choroid plexus; and abnormal surrounding tissue growths, such as colloid cysts, subependymal giant-cell tumours, nodules and harmatomas. and subsequently in his 1783 publication, Observations on the Structure and Functions of the Nervous System.
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