The striatal connections in frog Rana temporaria: an HRP study.

The ascending and descending connections of the striatum were studied in frogs by using an HRP method. The mesencephalo- and thalamo-striatal connections pass mainly in the lateral forebrain bundle and are preferentially ipsilateral. The cells sending their axons to the striatum are found in the posterolateral and posterocentral thalamic nuclei, in the ventral thalamus, in the mesencephalic tegmentum and in the torus semicircularis. The descending striatal connections are found to terminate in the ipsilateral mesencephalic tegmentum.