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Invertebrate Neuroscience

, 19:9 | Cite as

Investigating sensory processing in the pectines of the striped bark scorpion, Centruroides vittatus

  • Kendall L. Hughes
  • Douglas D. GaffinEmail author
Original Article
  • 65 Downloads

Abstract

Scorpion pectines detect chemical and physical stimuli via thousands of peg sensilla on ground-facing teeth. Each sensillum has multiple neurons that detect stimuli and transmit neural impulses to the subesophageal ganglion (SEG) in the central nervous system. Anatomically, the organization of the pectinal neuropil in the SEG reflects the arrangement of pectinal teeth, suggesting conservation of information about stimulus location in the SEG. In this study, neural impulses from the pectinal nerve of the striped bark scorpion (Centruroides vittatus) were recorded in the pecten, abdominal cavity, and SEG using electrophysiology. Recordings from the right pectinal nerve in the pecten showed that right tooth stimulations elicit sensory activity milliseconds before motor feedback, while left tooth stimulations only evoked motor spikes, suggesting no contralateral afferent communication between pectines. In the abdominal cavity recordings, two distinct waveforms (PN1 and PN2) were detected in baseline activity; PN1 seemed to enhance the likelihood that PN2 would fire, suggesting a possible excitatory interaction. Recordings from the SEG showed that mechanically stimulating different pectinal teeth evoked different compound neural activity patterns in the same SEG location. Stimulating the same tooth in succession showed mechanosensory adaptation. These recordings show promise for continued electrophysiological investigations of the scorpion SEG, and, in particular, how information from the pectines is processed and used for orientation.

Keywords

Electrophysiology Neural topography Subesophageal ganglion Chemosensory Mechanosensory 

Abbreviations

SEG

Subesophageal ganglion

PN1

Pectinal nerve spike type 1

PN2

Pectinal nerve spike type 2

SE1

Subesophageal spike type 1

SE2

Subesophageal spike type 2

Notes

Acknowledgements

We thank Dr. Mariëlle Hoefnagels for her critical review of this manuscript. We also thank Marie Labonte and Tanner Ortery for the care of the scorpions, Elise Knowlton for her guidance in preliminary trials, Brad Brayfield for technical assistance, Safra Shakir for assistance with the recordings, and Kathryn Ashford for assistance with photography of the pectines. We also thank the University of Oklahoma’s Honors College for an Undergraduate Research Opportunities Program grant.

Compliance with ethical standards

Conflict of interest

None.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of BiologyUniversity of OklahomaNormanUSA

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