septum pellucidum

septum pel·lu·ci·dum

noun \-pə-ˈlü-sə-dəm\

plural septa pel·lu·ci·da \-də\

Definition of SEPTUM PELLUCIDUM

: the thin double partition extending vertically from the lower surface of the corpus callosum to the fornix and neighboring parts, separating the lateral ventricles of the brain, and enclosing the fifth ventricle