Coculture with nontarget CNS increased numbers of OMP+ OSNs. Numbers of OMP+ cells were compared between ANM-alone cultures and ANM cells cocultured with cells from the olfactory bulb, cerebellum, cerebral cortex, or ventral mesencephalon. VM/ANM cocultures demonstrated statistically greater OMP+ OSN survival at 9, 12, and 15 DIV compared with ANM-alone cultures at the same time points (random effects GLS regression model; *p < 0.05). At 9 DIV, CERE/ANM cocultures contained greater numbers of OMP+ OSNs compared with ANM-alone (random effects GLS regression model; *p < 0.05). At no time did CORT/ANM cocultures contain greater numbers of OMP+ OSNs compared with ANM-alone. Error bars represent mean ± SEM.