Fig. 2

Schematic illustrating the hypothesized circuitry of the sea lamprey olfactory system. MOE = main olfactory epithelium; AOO = accessory olfactory organ; OB = olfactory bulb. Neuronal projections are based upon Ren et al., [27] and Derjean et al., [40]. The medial region of the olfactory bulb receives inputs from the accessory olfactory organ (AOO – blue) as well as sparse inputs from the main olfactory epithelium (MOE – orange). The medial projection neurons (green) project their axons to the posterior tuberculum (PT). The non-medial region of the olfactory bulb receives inputs from the main olfactory epithelium and the non-medial projection neurons (red) project their axons to the pallium. Red and green pipettes indicate location Green et al., [42] injected biocytin to retrogradely label projection neurons in the olfactory bulb (OB). This image is previously published in Green et al., [42]