The olfactory bulb is a structure located at the base of the brain that receives input from the OSNs. Within the olfactory bulb, the axons of OSNs converge on structures called glomeruli. Each glomerulus receives input from OSNs expressing the same olfactory receptor. The information is then processed by second-order neurons, which relay the signals to higher brain regions, including the olfactory cortex, for further processing and perception.
