The<unk> connect the lateral ventricles to the third ventricle. This allows cerebrospinal fluid produced in the lateral ventricles to reach the third ventricle and then the rest of the brain's ventricular system. The walls of the<unk> contain choroid plexus, a specialized structure that produces cerebrospinal fluid. The choroid plexus of the third ventricles continues through the<unk>  into the lateral ventricles. End branches of the medial posterior choroidal arteries, superior thalamostriate, superior choroid veins and septal veins also pass through the foramen. Clinical significance== The<unk> give rise to disease when they are narrowed or blocked. Narrowing of the foramen is more common in children 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. The most common symptom of blockage is headache; other symptoms include fainting, dementia, and coma, all of which are associated with obstructive hydrocephalus of the affected side or sides. Hydrocephalus can be identified by a CT scan or MRI scan of the brain, and treatment involves a neurosurgical operation in which an endoscope (i.e., a tiny camera and tools) is used to widen the foramen or create a new opening through the septum pellucidum between the lateral ventricles. If an obstructing mass is too large or too difficult to remove endoscopically, an open operation or the insertion of an artificial path between the ventricles and peritoneum may be required. Because of the intimate nature of pathways within the brain, such operations may result in damage to nearby structures, with complications including anterograde amnesia, inability to move half the body, akinetic mutism and disconnection syndromes.
Interventricular foramina 
Cortical homunculus
Cave of septum pellucidum
Cingulate sulcus
Medial eminence of floor of fourth ventricle
Cutis verticis gyrata
Horizontal fissure of cerebellum
Glia limitans