scholarly journals Pheromone-sensitive glomeruli in the primary olfactory centre of ants

2006 ◽  
Vol 273 (1598) ◽  
pp. 2219-2225 ◽  
Author(s):  
Nobuhiro Yamagata ◽  
Hiroshi Nishino ◽  
Makoto Mizunami
Keyword(s):  
Social Insects ◽  
Antennal Lobe ◽  
Communication Systems ◽  
Alarm Pheromone ◽  
Brain Structures ◽  
Projection Neurons ◽  
Sexual Pheromone ◽  
Social Bees ◽  
Colony Defence ◽  
Ecological Dominance

Tremendous evolutional success and the ecological dominance of social insects, including ants, termites and social bees, are due to their efficient social organizations and their underlying communication systems. Functional division into reproductive and sterile castes, cooperation in defending the nest, rearing the young and gathering food are all regulated by communication by means of various kinds of pheromones. No brain structures specifically involved in the processing of non-sexual pheromone have been physiologically identified in any social insects. By use of intracellular recording and staining techniques, we studied responses of projection neurons of the antennal lobe (primary olfactory centre) of ants to alarm pheromone, which plays predominant roles in colony defence. Among 23 alarm pheromone-sensitive projection neurons recorded and stained in this study, eight were uniglomerular projection neurons with dendrites in one glomerulus, a structural unit of the antennal lobe, and the remaining 15 were multiglomerular projection neurons with dendrites in multiple glomeruli. Notably, all alarm pheromone-sensitive uniglomerular projection neurons had dendrites in one of five ‘alarm pheromone-sensitive (AS)’ glomeruli that form a cluster in the dorsalmost part of the antennal lobe. All alarm pheromone-sensitive multiglomerular projection neurons had dendrites in some of the AS glomeruli as well as in glomeruli in the anterodorsal area of the antennal lobe. The results suggest that components of alarm pheromone are processed in a specific cluster of glomeruli in the antennal lobe of ants.

Morphology and physiology of antennal lobe projection neurons in the hawkmoth Agrius convolvuli

2017 ◽  
Vol 98 ◽  
pp. 214-222 ◽  
Author(s):  
Takuya Nirazawa ◽  
Takeshi Fujii ◽  
Yoichi Seki ◽  
Shigehiro Namiki ◽  
Tomoki Kazawa ◽  
...  
Keyword(s):  
Antennal Lobe ◽  
Projection Neurons

Temporal summation properties of the olfactory projection neurons in the moth antennal lobe revealed by optogenetic stimulation

2011 ◽  
Vol 71 ◽  
pp. e79
Author(s):  
Masashi Tabuchi ◽  
Takeshi Sakurai ◽  
Hidefumi Mitsuno ◽  
Shigehiro Namiki ◽  
Ryo Minegishi ◽  
...  
Keyword(s):  
Antennal Lobe ◽  
Temporal Summation ◽  
Projection Neurons ◽  
Optogenetic Stimulation

scholarly journals The Antennal Pathway of Dragonfly Nymphs, from Sensilla to the Brain

Insects ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 886
Author(s):  
Silvana Piersanti ◽  
Manuela Rebora ◽  
Gianandrea Salerno ◽  
Sylvia Anton
Keyword(s):  
Brain Structure ◽  
Antennal Lobe ◽  
Sensory Information ◽  
Brain Structures ◽  
Brain Regions ◽  
Adult Brain ◽  
Published Data ◽  
Antennal Sensilla ◽  
Aquatic Life ◽  
The Brain

Dragonflies are hemimetabolous insects, switching from an aquatic life style as nymphs to aerial life as adults, confronted to different environmental cues. How sensory structures on the antennae and the brain regions processing the incoming information are adapted to the reception of fundamentally different sensory cues has not been investigated in hemimetabolous insects. Here we describe the antennal sensilla, the general brain structure, and the antennal sensory pathways in the last six nymphal instars of Libellula depressa, in comparison with earlier published data from adults, using scanning electron microscopy, and antennal receptor neuron and antennal lobe output neuron mass-tracing with tetramethylrhodamin. Brain structure was visualized with an anti-synapsin antibody. Differently from adults, the nymphal antennal flagellum harbors many mechanoreceptive sensilla, one olfactory, and two thermo-hygroreceptive sensilla at all investigated instars. The nymphal brain is very similar to the adult brain throughout development, despite the considerable differences in antennal sensilla and habitat. Like in adults, nymphal brains contain mushroom bodies lacking calyces and small aglomerular antennal lobes. Antennal fibers innervate the antennal lobe similar to adult brains and the gnathal ganglion more prominently than in adults. Similar brain structures are thus used in L. depressa nymphs and adults to process diverging sensory information.

scholarly journals Death of an order: a comprehensive molecular phylogenetic study confirms that termites are eusocial cockroaches

2007 ◽  
Vol 3 (3) ◽  
pp. 331-335 ◽  
Author(s):  
Daegan Inward ◽  
George Beccaloni ◽  
Paul Eggleton
Keyword(s):  
Social Insects ◽  
Phylogenetic Analyses ◽  
Social Wasps ◽  
Phylogenetic Study ◽  
Social Bees ◽  
Molecular Phylogenetic Study ◽  
Molecular Phylogenetic ◽  
The Tropics

Termites are instantly recognizable mound-builders and house-eaters: their complex social lifestyles have made them incredibly successful throughout the tropics. Although known as ‘white ants’, they are not ants and their relationships with other insects remain unclear. Our molecular phylogenetic analyses, the most comprehensive yet attempted, show that termites are social cockroaches, no longer meriting being classified as a separate order (Isoptera) from the cockroaches (Blattodea). Instead, we propose that they should be treated as a family (Termitidae) of cockroaches. It is surprising to find that a group of wood-feeding cockroaches has evolved full sociality, as other ecologically dominant fully social insects (e.g. ants, social bees and social wasps) have evolved from solitary predatory wasps.

Offset response of the olfactory projection neurons in the moth antennal lobe

Biosystems ◽  
2011 ◽  
Vol 103 (3) ◽  
pp. 348-354 ◽  
Author(s):  
Shigehiro Namiki ◽  
Ryohei Kanzaki
Keyword(s):  
Antennal Lobe ◽  
Projection Neurons
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