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Localisation of parvalbumin‐immunoreactive structures in primate caudate‐putamen

To investigate the morphology, distribution, and connections of parvalbumin‐containing neurones in the caudate‐putamen of primates, perfuse‐fixed sections were stained to reveal parvalbumin immunoroactivity. In agreement with previous observations, the caudate‐putamen was rich in parvalbumin‐positive neurones and neuropil. The neuropil staining was uneven such that the dense background staining was interspersed with zones of relatively weak staining. The distribution corresponded to the striosome/matrix system as defined by substance P or met‐enkephalin immunostaining in adjacent sections. Because parvalbumin‐positive neurones are present in regions known to project to the caudate‐putamen and the majority of parvalbumin‐positive terminals in the matrix formed asymmetric synapses, it is concluded that the uneven staining is probably due to afferents of the neostriatum.