Topography of corticothalamic projections from different body part representations in primary somatosensory cortex (SI).

(A–C) Images from corresponding locations in the thalamus from three experiments, showing labeled corticothalamic axonal plexuses. Inset figures indicate the localization and extent of injection sites. (D, F) Semitransparent overlays of image panels A and B, and B and C, showing distinct topographical distribution patterns in full agreement with earlier results from dual-tracing experiments. (E) Computerized plots showing topographical distribution of corticothalamic projections following SI tracer injections, modified from [51] and [50]. Scale bar: 1 mm.