Anatomical Organization of Thalamic Projections to the First Somatic Sensory Cortex in the Cat

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The organization of thalamic neurons projecting to the first somatosensory cortex (SI) of the cat has been studied by retrograde transport of horseradish peroxidase (HRP). The SI receives fibers from the posteromedial (VPM) and posterolateral ventral nuclei (VPL) in a topically organized manner. The anteroventral part of the face area of SI receives inputs from the ventromedial portion of the VPM, exclusive of the medial parvocellular part, whereas the posterodorsal part of the face area receives fibers from the dorsolateral part of the VPM. The forelimb area of SI receives fibers from the ventromedial part of VPL, and the hindlimb area from the dorsolateral part of VPL. Cortical projections of the VPM and VPL to SI appear to be organized topically in the dorsoventral, mediolateral and anteroposterior directions. The entire extent of SI, particularly the posterodorsal part of the face area receives projections from the suprageniculate and paracentral nuclei. The posterodorsal part of SI receives many fibers from the lateral central, posterior lateral, anterior ventral and lateral ventral nuclei, and a few fibers from the medial pulvinar (ventrolateral part) and medial central nuclei. The posterior end of the face area of SI, a cortical vestibular center, receives a limited number of fibers from the medial geniculate, dorsal lateral and lateral pulvinar nuclei.
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