the reciprocal axonal connections between the caudoputamen and the substantia nigra permitted observation not only of hrp transported retrogradely from axons and axon terminals in the caudoputamen to the cell bodies of origin in the pars compacta of the substantia nigra , but also provided information suggesting that hrp may be transported anterogradely by neurons of the caudoputamen to their terminals , which are especially numerous in the pars reticulata of the substantia nigra .
C0038590
substantia nigra
C0175412
pars compacta