Superior view of the body of lateral ventricles with anterior horns of corpus callosum reflected. The corpus callosum forms the roof of the lateral ventricles. The lateral ventricles are separated medially by the midline septum pellucidum and bounded inferolaterally by the caudate nucleus. The thalamus is posteroinferior to the body of the lateral ventricles. The choroid plexus consists of ependymal cells that produce cerebrospinal fluid (CSF) and lie at the floor of the lateral ventricles. The interventricular foramen of Monro conveys CSF from the lateral ventricles to the midline third ventricle. (Image courtesy of AL Rhoton, Jr.)