Leg proprioceptors of the tobacco hornworm, Manduca sexta: organization of central projections at larval and adult stages

Microscopy Research and Technique
K S KentR Anderson

Abstract

Organization of the central neuropil of the insect ganglion is characterized in part by a modality-specific layering of afferent projections. This organization has been particularly well described for the central projections of thoracic leg sensory neurons of adult locusts, crickets, and flies. Tactile sensory neurons project into a ventral layer of neuropil, while proprioceptive sensory neurons project into an intermediate layer of neuropil. In order to determine whether a modality-specific layering exists in the CNS of larval Manduca sexta, we have examined the projections of sensory neurons innervating one class of putative proprioceptors, the campaniform sensilla, of the larval metathoracic legs. We find that campaniform sensory neurons of the larval legs have central projection patterns that generally distinguish them from each other and from the tactile sensory neurons. The campaniform projections, however, are not completely segregated from tactile projections in ventral layers of neuropil, as has been described in other insects. By contrast, the projections of campaniform sensory neurons from the adult legs are more extensive and elaborate than their larval counterparts and dramatically different from projections of nea...Continue Reading

References

Feb 1, 1990·Cell and Tissue Research·K S Kent, L M Griffin
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Citations

Apr 10, 2007·Developmental Biology·Kohtaro Tanaka, James W Truman
Jun 15, 2001·The Journal of Comparative Neurology·T KajiK Yasui
Nov 20, 2009·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Ricardo VierkHans-Joachim Pflüger
Jan 14, 2005·Development Genes and Evolution·Kohtaro Tanaka, James W Truman
Mar 21, 2000·The Journal of Comparative Neurology·C Consoulas
Feb 13, 2001·Brain Research Bulletin·C ConsoulasR B Levine

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