Magnified view within the temporal horn of the lateral ventricle via transtemporal approach. On the medial aspect of the temporal horn is the hippocampus, which has been retracted here to open the temporal horn for visualization. The choroid plexus lies within the temporal horn. The anterior choroidal artery irrigates the choroid plexus after entering the temporal horn via the choroidal fissure. (Image courtesy of AL Rhoton, Jr.)