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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Neurobiol Learn Mem. 2016 Jun 2;133:39–52. doi: 10.1016/j.nlm.2016.06.001

Figure 2.

Figure 2

A) Schematic of the basal forebrain (BF) cholinergic neurons that project to fear and extinction circuits. BF neurons in the preoptic area are not being shown, because these neurons are rarely manipulated in studies that examine the effects of BF cholinergic manipulation on fear and extinction memory. NBM neurons are showed in dashed lines while MS/DBB neurons are showed in solid lines. B) Summarized schematic of the cholinergic synapse in fear and extinction circuits. Post and pre prefixes refer to whether receptors are pre or post synaptic. ChTrans – choline transporter,