A note on the corticocaudate connexions in cat.

Following injections of labelled amino acids around the pericruciate gyrus and the medial aspect of gyrus genualis-proreus in cat, two entirely different projection patterns are found in the head of the caudate nucleus. Massive and multiple pericruciate injections failed to label the most medial caudate nucleus which, by contrast, appears selectively labelled following genualis-proreus injections. The respective accepted connexions of pericruciate and genualis-proreus cortices with the thalamus and other subcortical structures are different. Therefore, it appears that the lateral and medial regions of the caudate nucleus must differ in their hodological and, possibly, in their functional characteristics.