Figure 11.

Projections of A to the SC. A, In situ image of callosal connections retrogradely labeled with the fluorescent tracer bisbenzimide (blue). BDA injection site (arrow) in acallosal cortex (blue staining attributable to tissue damage) rostral to the anterior tip of V1. White lines indicate the rostrocaudal level of the coronal sections shown in B and B′. B, Coronal section showing bisbenzimide-labeled callosal connections and injection site (arrow) in acallosal cortex between the tip of V1 and the posterior border of S1. Arrowhead marks the A/S1 border. B′, Dark-field image of section adjacent to B, showing that BDA injection is confined to gray matter. C, Dark-field images of BDA-labeled axonal branches terminating in deep layers of the SC. Notice that the yellow rim at the pial surface represents artifactual luminescence unrelated to axonal labeling. Scale bars: A, B, B′, 1 mm; C, 0.5 mm. For abbreviations, see Figure 1.