Abstract
Unitary responses evoked in the nucleus medialis dorsalis (MD) of the thalamus after stimulation of the amygdaloid nuclei were studied in chloralosed cats. Latencies distribution histogram shows two peaks at 20–30 and 300–400 msec; 24% of the units pertaining to the short latency group had latencies between 10 and 16 msec, were always activated from the anterior amygdaloid area and rostral part of the n. basalis and were localized in the medial caudal half of the MD; 60% of the cells had latencies between 200 and 1,200 msec, discharge high frequency bursts and showed no specific topographical localization. The n. basalis was the most effective in evoking response among MD neurones. Results lend support to the contention that there is a direct pathway along fine fibres from the rostral parts of the amygdala to the MD.
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