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An accessory olfactory pathway in Lepidoptera: the labial pit organ and its central projections in Manduca sexta and certain other sphinx moths and silk moths

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Summary

In the hawkmoth, Manduca sexta, the third segment of each labial palp contains a pit, which houses a densely packed array of sensilla. We have named this structure the labial pit organ (LPO). The sensilla within the pit are typical of olfactory receptors, characterized by a grooved surface, wall pores, and pore tubules. Axons arising from receptor cells that innervate these sensilla project bilaterally to a single glomerulus in each antennal lobe. We have compared this central projection with that in three other species of Manduca (M. quinquemaculata, M. dilucida, and M. lanuginosa) and in the silkmoths Antheraea polyphemus and Bombyx mori. A bilateral projection to a single glomerulus in each antennal lobe is present in all cases. We suggest that the LPO serves as an accessory olfactory organ in adult Lepidoptera.

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Authors and Affiliations

  1. Department of Biological Sciences, Columbia University, New York, NY, USA

    K. S. Kent, I. D. Harrow, P. Quartararo &  J. G. Hildebrand

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  1. K. S. Kent
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  2. I. D. Harrow
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  3. P. Quartararo
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  4. J. G. Hildebrand
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Kent, K.S., Harrow, I.D., Quartararo, P. et al. An accessory olfactory pathway in Lepidoptera: the labial pit organ and its central projections in Manduca sexta and certain other sphinx moths and silk moths. Cell Tissue Res. 245, 237–245 (1986). https://doi.org/10.1007/BF00213927

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