Injections of anterograde tracer were made into three cortical regions: anterior (presumptive motor), middle (presumptive somatosensory) and posterior (presumptive visual cortex).

Because some variability is evident in the A/P length of brains at similar early ages, we also list pup weight in grams. The Label lists only those putative major thalamic nuclei in which we have a great degree of confidence in identification at these ages; other nuclei were also labeled (see also [56]).Abbreviations: dorsal lateral geniculate nucleus, dLGN; lateral nucleus, L; mediodorsal nucleus, MD; posteromedial nucleus, PoM; reticular nucleus, R; ventrobasal nucleus, VB; ventrolateral nucleus, VL; ventral lateral geniculate nucleus, vLGN.