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. Author manuscript; available in PMC: 2016 Dec 11.
Published in final edited form as: Curr Opin Neurobiol. 2014 Jul 23;29:126–132. doi: 10.1016/j.conb.2014.07.004

Figure 1.

Figure 1

A. Simplified schematic diagram of visual system thalamic circuitry depicting multiple types in inhibitory inputs. Inhibitory axonal outputs (F1 terminals) arise from both local circuit neurons in dLGN as well thalamic reticular nucleus (TRN) neurons. Presynaptic dendrites (F2 terminals) of interneurons (Int) are innervated by retinogeniculate axons, which also innervate the dendrite of thalamocortical neuron (TC). Adapted from [22]. B. Schematic illustrating multiple transmitter systems that have been shown to alter the output of putative F2 terminals. The cortical pathway engaging mGluR2/3 (gray circle) clearly involves F1 terminals but unclear if engages F2 terminals [22].