AFFERENT CONNECTIONS OF THE AMYGDALOID COMPLEX——STUDIES WITH RETROGRADE AXONAL TRANSPORT METHOD OF HRP IN THE CENTRAL AND MEDIAL NUCLEI OF AMYGDALA IN THE RAT / 解剖学报

ABSTRACT

The afferent connections to the nucleus amygdaloideus centralis and nucleusamygdaloideus medialis in 42 albino rats were examined by means of retrogradetransport method of horseradish peroxidase(HRP).The microinjection syringe needle or microelectrophoretic pipette was insertedstereotaxically from vertical or oblipue approaches.The injections of HRP weregiven in the central and medial nuclei of the amygdaloid complex.The results were as followsFollowing the injections of HRP into the nucleus amygdaloideus centralis,label-ed cells were always found in prepiriform cortex,periamygdaloid cortex,entorhinalcortex,ventral part the caudoputamen and globus pallidus,nucleus lateralis hy-pothalami,nucleus parafascicularis,corporis geniculati medialis,nucleus raphe dosalis,nucleus parabrachialis,locus coeruleus and zona reticulate substantia nigra.While HRP was injected into the nucleus amygdaloideus medialis,the labeledcells were always found in bed nucleus of stria terminalis,nucleus ventromedialis(hypothalami)and substantia nigra pars compacta.As the injections were given from lateral oblique approaches,labeled cells werenot found in the neo-cortex.There were no labeled cells demonstrated in the nuc-leus solitarius.In the above-mentioned areas nucleus ventromedialis(hypothalami),nucleusparabrachialis and locus coeruleus were often labeled bilaterally while others,ipsila-terally.