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The macroglomerular complex (MGC) is the first-order center for synaptic processing of olfactory information about the female sex pheromone in the male moth brain. We have investigated the MGC subdivisions of the male silkmoth Bombyx mori by use of three-dimensional reconstruction of the MGC from sequential series of confocal slice images. The B. mori MGC consists of three subdivisions similar to those of Manduca sexta: the cumulus, toroid and horseshoe. Intracellular recording and staining revealed that responses of MGC projection neurons to pheromonal stimulation correlate with their dendritic arborizations in the subdivisions of the MGC (the cumulus, toroid and horseshoe) and each subdivision specific projection neuron transmits information to different regions in the calyces of the mushroom body and the inferior lateral protocerebrum. We revealed that major pheromone component information is transferred to the medial part of the inferior lateral protocerebrum through three different antennocerebral pathways. Although it is generally accepted that the calyces of the mushroom body and the inferior lateral protocerebrum are the target sites for pheromone information from the MGC in moths, our results suggest that the medial part of the inferior lateral protocerebrum may be a more important processing site for major pheromonal information in B. mori.

Projections to Higher Olfactory Centers from Subdivisions of the Antennal Lobe Macroglomerular Complex of the Male Silkmoth