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. 2015 Sep 9;10(9):e0137702. doi: 10.1371/journal.pone.0137702

Fig 9. Potential TNAC synaptic circuitry.

Fig 9

TNAC presumably receives direct excitatory (glutamatergic) input from rod and cone ON and OFF bipolar cells and inhibitory input from unidentified GABAergic amacrine cells that are driven by the rod and cone ON and OFF bipolar cells. The correspondence between TNAC and AC42 in Helmstaedter et al.'s connectomic analysis (2013) of the mouse retina suggests that the predominate sources of ON and OFF cone bipolar cell (CBC) input is CBC type 5 and CBC types 3 & 4, respectively. The circuit diagram does not show the network of gap junctional coupling between TNACs or between TNAC and an unidentified retinal neuron in the inner nuclear layer (see Fig 1).