Abstract
Axonal collateralization of neurons whose divergent branches innervate the medial prefrontal cortex (MFC) and the sulcal cortex was studied in the rat by using the retrograde double-labeling technique. Injections of bisbenzimide and propidium iodide into the MFC and sulcal cortex resulted in double-labeling of a small population of cells within the ventral tegmental area (VTA) and pars compacta of the substantia nigra (SNC). More extensive double-labeling was evident in the midbrain raphe nuclei. Collateralization therefore does not appear to be an important property of the dopamine innervation of the prefrontal cortex.
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