Termination of thalamic intralaminar nuclei afferents in visual cortex of squirrel monkey

The projection of the thalamic intralaminar nuclei (ILN) upon the visual cortex in the squirrel monkey was studied using anterograde, autoradiographic techniques. In area 17, the ILN afferents terminate in the inner and outer portions of lamina V, whereas in areas 18 and 19 the fibers terminate more diffusely along the laminae V-VI boundary. Widespread labeling of layer I is seen throughout the occipital cortex.