Abstract
Sensory information, mainly olfactory, collected by each antenna is coded by numerous neuroreceptors. These neuroreceptors project to the ipsilateral antennal lobe (AL), a well-defined area of the insect brain, where they synapse with cerebral neurones within discrete, spheroidal knots of synaptic complexes, the glomeruli. We give evidence, based mainly on the cockroach Blaberus craniifer and the moth Mamestra brassicae, that the glomeruli are morphologically, morphometrically and ontogenetically identifiable units that are present in constant number and are arranged orderly in both species. However, the size of identified glomeruli varies significantly depending on species, sex and developmental stage. These size variations are related to variations in number of specific subsets of antennal neuroreceptors and give some insight into the functional role of the variant glomeruli. The most conspicuous sex-dimorphic glomeruli are the male macroglomerular complexes. They are present in species whose males detect the sex pheromone emitted by females and absent in species, such as the butterfly Pieris brassicae, which rely on visual cues for mating. During the postembryonic development of Blaberus, glomeruli increase exponentially in size at greatly varying growth rates. The glomeruli with the highest and lowest growth rates form 3 distinct subsets, which suggests that neuroreceptors of the same growth type (possibly of the same modality) project to specific areas. The significance of these results on the connections between antenna and antennal lobe, and the function of glomeruli is discussed.
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Rospars, JP., Chambille, I. (1989). Identified Glomeruli in the Antennal Lobes of Insects: In Variance, Sexual Variation and Postembryonic Development. In: Singh, R.N., Strausfeld, N.J. (eds) Neurobiology of Sensory Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2519-0_23
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DOI: https://doi.org/10.1007/978-1-4899-2519-0_23
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