[2] The olfactory receptor neurons in the antenna and maxillary palps project into the olfactory lobes of the insect brain, which in turn project the higher order processing centers, the lateral horn or the mushroom bodies.
[4] When an insect encounters an odor to which it has no innate or learned response associated (an unconditioned stimulus), the signals are sent down the projecting neurons to the Kenyon cells of the mushroom bodies.
[4] Cross-talk between the lateral lobe and the mushroom bodies adds flexibility to learned and innate behavioral responses.
For example, the integration of learned and innate behavioral responses is especially important in social insects such as honeybees.
Honey bees use pheromones and specific body movements to communicate with other members of the hive.
[4] A good example of this is the fact that the male drosophila's lateral horn is 1% larger than females of the same species.
[4] In moths the male-specific projecting pheromone-processing neurons innervate with glomeruli outside of the macroglomerular complex of the antennal lobe.
[4] The lateral horn neurons that synapse with the ventral nerve cord are dimorphic in their structure and respond to the drosophila sex pheromone cVA.