Subcortical Connections from Temporal Cortex of Monkey

The neocortex of the lateral surface of the temporal lobe of man and monkey may be divided cytoarchitecturally into three main portions: temporal tip (TG), superior temporal gyrus (TA), and second temporal gyrus (TE).* As these areas have been shown to possess important functions,† it is obviously desirable to determine, as precisely as possible, their connections with the remainder of the brain. Earlier studies have revealed pathways connecting the temporal cortex with portions of the thalamus and lower brain stem.‡ The present experiments have employed electrical recording and neuronographic techniques to investigate temporal connections with the basal ganglia, the amygdala, and the neighboring rhinencephalic cortex. MATERIALS AND METHODS Nineteen monkeys (Macacus mulattus) were prepared under ether anesthesia, immobilized by the intravenous injection of tubocurarine chloride U. S. P. (d-tubocurarine), and maintained under artificial respiration. The temporal cortex was exposed by a small craniotomy and protected by the application of