Figure 4. Summary diagram showing possible multisynaptic pathways from the MTL to V4.

Our results indicate that the entorhinal cortex (Ent) provides trisynaptic input to V4 via either the parahippocampal cortex (PHC) or the inferotemporal cortex (IT), while the hippocampus (HC) does through “short-cut” pathways that bypass the Ent, as denoted by orange arrows. The gray area represents the approximate location whole extent of the rabies injection sites in 4 monkeys used for the present study. For clarity, only presumably major pathways are shown here (see Discussion for details). HC, hippocampus; 1st, first-order neurons; 2nd, second-order neurons; 3rd, third-order neurons.