Figure 8.

Representative examples of axon collaterals in the target structures of IT neurons. These photographs were obtained from multiple IT neurons. A, B, Axon fibers of IT neurons reached the upper layers (layers 1–2/3) of the ipsilateral AGm and contralateral AGm. C, D, IT neurons sent axons to layers 1–5 of the ipsilateral AGl and layers 1–5 of the contralateral AGl. E, Axon fibers in layer 5–6 of the ipsilateral FL. F, Two of the five IT neurons projected to layers 5–6 and layer 1 of the ipsilateral S1BF. Barrels are indicated by asterisks. The inset gives a magnified view of the rectangular area. G, Three of the five IT neurons projected to the ipsilateral CPu. H, All of the IT neurons innervated the contralateral CPu.