Abstract
Acute electrophysiological experiments on lizards (Ophisaurus apodus) showed that electrical stimulation of the anterior dorsolateral thalamic nucleus and medial forebrain bundle evokes short-latency responses in the hippocampal (mediodorsal) cortex which coincides in distribution and configuration with responses in the same cortical area to sensory stimulation. Extensive destruction of these structures inhibits, or even completely blocks, the conduction of sensory (visual, somatic, audiovibratory) and tactile impulses to the hippocampal cortex. It is concluded that the anterior dorsolateral thalamic nucleus and medial forebrain bundle constitutes, if not the only, at least the principal pathway for transmission of these sensory impulses to the hippocampal cortex in lizards.
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