Olfactory receptors (smell receptors, odorant receptors) are chemoreceptors, responsible for the detection of smell. Olfactory receptors are located in the olfactory receptor cells (neurons) in the nasal cavity. Odor molecules attach for the cilia, extensions of the olfactory receptor cells. As a consequence, activated olfactory receptors start signal transduction and thus transmit information about odor to the brain.
