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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: J Comp Neurol. 2017 Feb 22;525(7):1668–1684. doi: 10.1002/cne.24158

Figure 8. Schematic of BF projections.

Figure 8

Reciprocal projections between the BF and orexin neurons. Previous studies show that the orexin neurons innervate cholinergic and non-cholinergic neurons of the entire BF. Glutamatergic (Glut) neurons of the MCPO and SI heavily innervate and excite the orexin neurons. GABAergic (GABA) neurons of these regions project heavily to the orexin neurons but rarely form functional synapses on orexin neurons. Non-cholinergic projections from the MS and HDB are light. Cholinergic (ChAT) BF neurons do not project to the orexin neurons.