Limbic Nuclei of Thalamus and Connections of Limbic Cortex

I. Organization of the Projections of the Anterior Group of Nuclei and of the Midline Nuclei of the Thalamus to the Anterior Cingulate Gyrus and Hippocampal Rudiment in the Monkey

Introduction  The views expressed in the literature on the cortical projection fields of the anterior nuclei, midline nuclei, and lateral dorsal nucleus of the thalamus are vague and often contradictory. LeGros Clark and Boggon⁵ were apparently the first to point out that the anterior thalamic nuclei in the cat project to the whole length of cingulate gyrus. Walker²⁶ suggested that the anterior medial nucleus in the monkey projects to the inferior surface of the frontal lobe. Later he was inclined to the view that the anterior group of nuclei projects mainly to the posterior part of the cingulate gyrus and that the anterior part of the gyrus (area 24-LA in terminology used by us) "receives few if any fibers from the thalamus."²⁷ Bailey and co-workers,¹ using the neuronographic method of strychnine-evoked potentials also came to the conclusion that the anterior cingulate gyrus is athalamic. However, Mettler