The caudate nucleus and the lentiform nucleus are both part of the striated body (corpus striatum) of white and grey nerve fibres located just laterally from the fornix within the brain. The lentiform nucleus, or nucleus lenticularis, is the extra-ventricular portion, as it is imbedded in the white material of the cerebral hemisphere. The caudate nucleus, or nucleus caudatus, extends from the outer side of the optic thalamus to the roof of the decending cornu of the lateral ventricle, at the apex of the temporal lobe. Research Caudate Nucleus