SII projects to the transitional zone between AGm and AGl (Figures 4C), which is the same MI region that receives projections from SI. [...] the labeled projections to MI appeared weaker and were less extensive than the terminal labeling observed after tracer injections in SI. The SII projections innervated layers II, III, and the lower part of layer V of MI, but were weaker in upper layer V and did not innervate any part of layer VI. The SII projection terminals were more concentrated in the rostral half than in the caudal half of MI (Figure 4D). Collator note: +3.20 - +2.50 mm from bregma, Swanson Atlas Levels 8-11.

[…] corresponding whisker representations were injected in both areas as indicated by the presence of BDA-labeled neurons at the FR injection site. Collator note: rostral double labeling of the Mop, rostrally. See Fig 5D, Swanson Atlas Levels 8-10 ( +3.10 - +2.20 mm from bregma). The amount of overlap is about 18-19% for SI and SII in layers III and V of the primary motor cortex (Fig. 7A).