Olfactory stimuli play an important part in animal communication, and a special terminology has been used for substances that function in this manner. In 1932 Bethe employed the term ectohormone with reference to substances, such as insect sexual attractants, which are external rather than internal secretions and act as chemical messengers between individuals rather than between different parts of the same individual. This self-contradictory term went out of use following the introduction of the term pheromone, defined by Karlson and Butenandt in 1959 as “substances secreted to the outside of an individual and received by a second individual of the same species in which they release a specific reaction, for example, a definite behaviour or developmental process.”
KeywordsOlfactory System Main Olfactory Bulb Olfactory Information Vomeronasal Organ Accessory Olfactory Bulb
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