Abstract
Because of great inter-individual variability in the sizes and configurations of monkey brains, consistent intracerebral stereotaxic placements are not possible when a general brain atlas is relied upon to derive placement coordinates. We describe a procedure that allows the determination of brain atlases for individual monkeys using proton magnetic resonance imaging and the translation of image coordinates to stereotaxic coordinates. The latter is accomplished by chronically implanting glass beads filled with copper sulfate into the skull to establish a plane horizontal to the stereotaxic plane and to provide reference points for zeroing stereotaxic carriers during intracerebral implants. The efficacy of this procedure was confirmed experimentally.
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