NUCLEUS-RETICULARIS THALAMI INPUT TO THE ANTERIOR THALAMIC NUCLEI IN THE MONKEY - A LIGHT AND ELECTRON-MICROSCOPIC STUDY

Three anterograde tracers (PHA-L, WGA-HRP, BDA) placed in the most dor somedial segment of the anterior part of the nucleus reticularis thala mi (NRT) in the Rhesus monkey combined with postembedding immunoctoche mistry with anti-GABA antibody resulted in double labeling of a distin ct population of synaptic boutons in the thalamic nuclei of the anteri or group as well as laterodorsal and mediodorsal nuclei. EM analysis o f the labeled terminals in the anteroventral and anteromedial parts of the anterior nuclear complex showed that the NRT input is distributed diffusely and in equal proportion to the dendrites of projection and local circuit neurons.