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The Virtual Atlas of the Honeybee Brain

1. Olfactory projection neurons (PN) and a local interneuron (LI)

Brandt et al. (2005), J Comp Neurol, 492, 1-19

A heterogenous local interneuron which sparsely innervates several glomeruli and exhibits dense ramifications in an identified glomerlus of the T3 group.
registered in:

  • Brandt R, Rohlfing T, Rybak J, Krofczik S, Maye A, Westerhoff M, Hege HC, Menzel R (2005) A three-dimensional Average-shape atlas of the honeybee brain based on confocal images. Journal of Comparative Neurology 492 1: 1-19


  • Fonta C, Sun XJ, and Masson C. (1993) Morphology and spatial distribution of bee antennal lobe interneurones responsive to odours. Chemical Senses 18,2:101-119.

Uniglomerular projection neuron 1 of the antennal lobe

The identified neuron PNI arborises in the T3_60 glomerulus. The soma is located in the ventral rind of the AL. It runs via the median Antennocerebralis tract (m-ACT)  to the mushroom body calyces and to the lateral horn.

references: see PN II
reconstruction by S. Krofczik

Uniglomerular Projection neuron 2

The identified projection neuron PN II with its soma in the medial rind of the AL can be allocated to the T2_04 glomerulus. PNII is a m-ACT neuron projecting to the lip region of the calyxes and to the lateral horn. Note the overlap with the Pe_1 neuron in the olateral horn: arrow in 2


  • Homberg U. 1984. Processing of antennal information in extrinsic mushroom body neurons of the bee brain. J Comp Physiol [A] 154:825–836.
  • Abel R, Rybak J, Menzel R. 2001. Structure and response patterns of olfactory interneurons in the honeybee, Apis mellifera. J Comp Neurol 437:363–383.
  • Brandt, R., Rohlfing, T., Rybak, J., Krofczik, S., Maye, A., Westerhoff, M., Hege, H.-C., & Menzel, R. 2005. A three-dimensional average-shape atlas of the honeybee brain and its applications. J.Comparative Neurology 492, 1-19.
  • Kirschner S, Kleineidam CJ, Zube C, Rybak J, Grünewald B, Rössler W. (2006) Dual olfactory pathway in the honeybee, Apis mellifera. J Comp Neurol. Dec 20;499(6):933-52

reconstructed by Sabine Krofczik

2. MB extrinsic neuron, PE1, and MB extrinsic olfactory interneuron, PN II