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. 2021 Aug 13;12:4911. doi: 10.1038/s41467-021-24928-6

Fig. 9. Summary circuit model. Schematics of the FB circuit motifs were discovered in this study.

Fig. 9

Triangles: pyramidal cell somata; circles: thalamic cell somata; arrows: axonal projections (thickness indicates projection magnitude). All axonal projections in this scheme are excitatory and terminate onto excitatory cells. Some V2 FB neurons (left V2 blue cell) make monosynaptic contacts with V1 neurons projecting to V2 (green pyramidal cell). The latter receive the majority of their long-range cortical inputs from other pyramidal neurons within V1 (red cell). Some V2 neurons in L5 (right V2 blue cell) sending FB to V1 receive monosynaptic inputs from FB neurons in higher extrastriate areas (blue cell in the extrastriate cortex), as well as sparse inputs from the LGN and lateral pulvinar (round green cells).