The mechanism of the olfactory system can be divided into a
peripheral one, sensing an external stimulus and encoding it as an
electric signal in neurons, and a central one, where all signals
are integrated and processed in the central nervous system. The
peripheral olfactory system receptors are connected to bipolar
olfactory receptor neurons in the olfactory epithelium.
Fot the central olfactory system, axons from the olfactory
sensory neurons converge in the olfactory bulb.