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Chemical Senses Advance Access published online on November 23, 2005
Chemical Senses, doi:10.1093/chemse/bjj006
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org
Accepted November 3, 2005

Article

Specific Projection of the Sensory Crypt Cells in the Olfactory System in Crucian Carp, Carassius carassius

El Hassan Hamdani 1 * and Kjell B. Døving 1

1 Department of Molecular Biosciences, University of Oslo, PO Box 1041, Blindern, 0316 Oslo, Norway

* To whom correspondence should be addressed.
El Hassan Hamdani, E-mail: elhassan.hamdani{at}bio.uio.no


  Abstract

To study the projection of a special type of sensory neuron called crypt cells in the olfactory system in crucian carp, Carassius carassius, we applied the neural tracer 1,1-dilinoleyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI) in the olfactory bulb (OB). Small crystals of DiI were applied in a small area at the synaptic region at the ventral part of the OB, where a population of secondary neurons specific for sex pheromones has been identified. In those samples (4 out of 24) where only axons in the lateral bundle of the medial olfactory tract were stained, the majority (50-66%) of olfactory sensory neurons stained were crypt cells situated in the peripheral layer of the olfactory epithelium. Because this bundle of the tract mediates reproductive behavior, it is conceivable that crypt cells express olfactory receptors for sex pheromones.

Keywords: convergence; fish; olfaction; projection; receptor neurons; sex.
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