RESUMEN
The projection from the ventral posterior nucleus (VP) of the thalamus to the somatic sensory cortical area (SmI) in the rat was studied with the horseradish peroxidase (HRP) method.When injections were made into the anterior part of SmI (Brodmann 3), labeled cells were found in the ventral area of caudal VP. When injections were made into the posterior part of SmI (Brodmann 3,1), Iabeled cells were observed in the dorsal area of caudal VP. With injections located near the superior part of SmI (Brodmann 3), labeled cells were found in the lateral area of VP. When injections were made into the inferior part of SmI (Brodmann 2), labeled cells were seen in the medial area of VP.All labeled cells were observed in the injected side, indicating that the projection is uncrossed.Neurons in VP Projecting to Brodmann 2 is less than those projecting to Brodmann 3.Relationship between the quantity of labeled neurons and the amount of projection fibers was discussed.