Abstract
Neurons in the lateral parabrachial nucleus (LPB) of the rat were analyzed by the intracellular horseradish peroxidase method. Sixteen LPB neurons were successfully labeled with HRP injected intracellularly. HRP-labeled LPB neurons were divided into type I (7 neurons) and type II (9 neurons) LPB neurons. Type I LPB neurons, which were activated antidromically by stimulation of the ipsilateral posteromedial ventral nucleus of the thalamus, had long dendrites and a long axon. Type II LPB neurons, which were not activated antidromically by the stimulation of the thalamus, had short dendrites and a short axon. It was concluded that type I LPB neurons were projection neurons, while type II LPB neurons were local circuit neurons.
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