Chapter

Antennal Lobe of the Honeybee

Randolf Menzel and Jürgen Rybak

in Handbook of Brain Microcircuits

Published on behalf of Oxford University Press

Published in print August 2010 | ISBN: 9780195389883
Published online September 2012 | e-ISBN: 9780199965137 | DOI: http://dx.doi.org/10.1093/med/9780195389883.003.0043
Antennal Lobe of the Honeybee

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In the honeybee chemoreceptors of the antenna converge in approximately 160 glomeruli in the antennal lobe (AL) and feed a network of local interneurons and projection neurons. The latter target two central brain areas of the protocerebrum: the mushroom body calyces and the lateral protocerebral lobe. Calcium imaging of glomerular activity patterns induced by olfactory stimulation reveals a spatial combinatorial code that is influenced by GABA inhibitory local interneurons. Uniglomerular projection neurons leave the AL via two separate tracts and respond to olfactory stimuli later than local interneurons indicating direct sensory input to local interneurons. Projection neurons of the lateral and median tract code odor concentration and mixture differently. The local circuits are modulated by multiglomerular neurons from the suboesophageal ganglion containing octopamine and serotonine.

Chapter.  2277 words.  Illustrated.

Subjects: Development of the Nervous System

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