Abstract
The noradrenergic innervation of the developing dorsal lateral geniculate nucleus of the rat was examined with light and electron microscopic immunocytochemistry. At birth, few, relatively thick, noradrenergic fibers innervated the nucleus. Their density was steadily increased and they became thinner, tortuous, and varicose with the progression of age. Only a minority (11–15%) of labeled varicosities made synaptic contacts. Most of these synapses were symmetrical and on dendritic shafts. The present findings demonstrate the establishment of the anatomical relationships between noradrenergic afferents and neurons of the dorsal lateral geniculate nucleus during development and may help to understand the role of noradrenaline in the processing of visual information.
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