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Differential distribution and non-collateralization of central amygdaloid neurons projecting to different medullary
1Department of Anatomy, University of Iowa, Iowa City 52242.
Abstract:
The distributions of central amygdaloid nucleus (Ce) neurons projecting to different medullary regions were investigated using the retrograde transport of iontophoretically applied Fast Blue or bisbenzimide. Neurons projecting to the nucleus of the solitary tract were located throughout the medial, lateral and ventral subdivisions of the Ce whereas cells projecting to the parvicellular reticular formation and ventrolateral medulla were confined to the medial subdivision of the Ce. Combined injections of fluorescent dyes into these medullary areas resulted in only occasional double-labelled cells. The results suggest that Ce projections to a variety of medullary sites arise from separate populations of neurons with partially overlapping distributions in the medial Ce.