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Journal of Comparative Physiology A

, Volume 155, Issue 4, pp 485–493 | Cite as

Varieties of filiform hairs: range fractionation by sensory afferents and cereal interneurons of a cricket

  • Tateo Shimozawa
  • Masamichi Kanou
Article

Summary

  1. 1.

    Wide variations in the size of the cercal filiform hairs inGryllus bimaculatus are described (Figs. 1, 2). The length of the hairs varies from 30 to 1,500 μm, while the diameter varies from 1.5 to 9 μm (Fig. 2). The range of hair length overlaps well with the physical depth of air-motion on a substrate floor. The length dependency of sensory threshold to air-current stimulus is predictable.

     
  2. 2.

    The sensory threshold to the alternating air-current stimulus was measured. The sensory afferent was penetrated at the cereal nerve bundle. The length of the filiform hair of the recorded afferent was identified by needle probe. All sensory afferents showed phase locked responses to each cycle of bursts of sinusoidal air-current (Fig. 3).

     
  3. 3.

    The long filiform hairs are spontaneously active and sensitive to a low frequency stimulus (Figs. 3, 4). They are regarded as velocity sensitive hairs. The short hairs are spontaneously inactive and insensitive to low frequency stimulus. They are acceleration sensitive hairs.

     
  4. 4.

    The selective deprivation of the sensory hairs longer than 500 μm has little effect on the threshold of large interneurons 9-1 (LGI) and 8-1 (MGI) (Fig. 6). Under the same deprivation we were unable to record small-sized interneurons 10-2 and 10-3.

     
  5. 5.

    The threshold curves of the sensory hairs and those of the cereal interneurons are compared (Fig. 7). The conspicuously long cereal filiform hairs converge upon two small sized interneurons 10-2 and 10-3. Large cereal interneurons 9-1 (LGI) and 8-1 (MGI) receive the main excitatory sensory input from the short hairs around 200–300 μm.

     

Keywords

Sensory Threshold Nerve Bundle Hair Length Threshold Curve Sensory Hair 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bentley D (1975) Single gene cricket mutations: Effects on behavior, sensilla, sensory neurons, and identified interneurons. Science 187:760–764Google Scholar
  2. Bentley D, Hoy RR (1974) The neurobiology of cricket song. Sci Am 231:34–44Google Scholar
  3. Camhi JM, Tom W (1978) The escape behavior of the cockroachPeriplaneta americana. I. Turning response to wind puffs. J Comp Physiol 128:193–201Google Scholar
  4. Camhi JM, Tom W, Volman S (1978) The escape behavior of the cockroachPeriplaneta americana. II. Detection of natural predators by air displacement. J Comp Physiol 128:203–212Google Scholar
  5. Chapman KM, Smith RS (1963) A linear transfer function underlying impulse frequency modulation in a cockroach mechanoreceptor. Nature 197:699–700Google Scholar
  6. Counter SA (1976) An electrophysiological study of sound sensitive neurons in the ‘primitive ear’ ofAcheta domesticus. J Insect Physiol 22:1–8Google Scholar
  7. Dagan D, Camhi JM (1979) Responses to wind recorded from the cereal nerve of the cockroachPeriplaneta americana. II. Directional selectivity of the sensory neurons innervating single columns of filiform hairs. J Comp Physiol 133:103–110Google Scholar
  8. Dumpert K, Gnatzy W (1977) Cricket combined mechanoreceptors and kicking response. J Comp Physiol 122:9–25Google Scholar
  9. Edwards JS, Palka J (1974) The cerci and abdominal giant fibres of the house cricket,Acheta domesticus. I. Anatomy and physiology of normal adults. Proc R Soc Lond B 185:83–103Google Scholar
  10. Gnatzy W, Tautz J (1980) Ultrastructure and mechanical properties of an insect mechanoreceptor: Stimulus-transmitting structures and sensory apparatus of the cereal filiform hairs ofGryllus. Cell Tissue Res 213:441–463Google Scholar
  11. Kämper G (1984) Abdominal ascending interneurons in crickets: Responses to sound at the 30-Hz calling song frequency. J Comp Physiol A 155:507–520Google Scholar
  12. Kanou M, Shimozawa T (1984) A threshold analysis of cricket cereal interneurons by an alternating air-current stimulus. J Comp Physiol A 154:357–365Google Scholar
  13. Levine RB, Murphey RK (1980) Pre- and postsynaptic inhibition of identified giant interneurons in the cricket (Acheta domesticus). J Comp Physiol 135:269–282Google Scholar
  14. Matsumoto SG, Murphey RK (1977) The cercus-to-giant interneuron system of crickets. IV. Patterns of connectivity between receptors and the medial giant interneuron. J Comp Physiol 119:319–330Google Scholar
  15. Murphey RK, Palka J, Hustert R (1977) The cercus-to-giant interneuron system of crickets. II. Response characteristics of two giant interneurons. J Comp Physiol 119:285–300Google Scholar
  16. Nicklaus R (1965) Die Erregung einzelner Fadenhaare vonPeriplaneta americana in Abhängigkeit von der Größbe und Richtung der Auslenkung. Z Vergl Physiol 50:331–362Google Scholar
  17. Palka J, Levine R, Schubiger M (1977) The cercus-to-giant interneuron system of crickets. I. Some attributes of sensory cells. J Comp Physiol 119:267–283Google Scholar
  18. Palka J, Olberg R (1977) The cercus-to-giant interneuron system of crickets. III. Receptive field organization. J Comp Physiol 119:301–317Google Scholar
  19. Petrovskaya YD, Rozhkova GI, Tokareva VS (1970) Characteristics of single receptors of the cereal auditory system of the house cricket. Biofizika 15:1112–1119 (English version)Google Scholar
  20. Plummer MR, Camhi JM (1981) Discrimination of sensory signals from noise in the escape system of the cockroach: The role of wind acceleration. J Comp Physiol 142:347–357Google Scholar
  21. Schlichting H (1979) Exact solutions of the Navier-Stokes equations. In: Boundary layer theory. McGraw-Hill, New York, pp 83–112Google Scholar
  22. Shen J-X (1983) The cercus-to-giant interneuron system in the bushcricketTettigonia cantans: Morphology and response to low-frequency sound. J Comp Physiol 151:449–459Google Scholar
  23. Shimozawa T, Kanou M (1984) The aerodynamics and sensory physiology of range fractionation in the filiform sensilla of the cricketGryllus bimaculatus. J Comp Physiol A 155:495–505Google Scholar
  24. Tautz J (1979) Reception of particle oscillation in a medium. An unorthodox sensory capacity. Naturwissenschaften 66:452–461Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Tateo Shimozawa
    • 1
    • 2
  • Masamichi Kanou
    • 1
    • 2
  1. 1.Division of Behavior and NeurobiologyNational Institute for Basic BiologyOkazakiJapan
  2. 2.Zoological Institute, Faculty of ScienceHokkaido UniversitySapporoJapan

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