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Sensory-motor interactions in antennal reflexes of the American lobster

Summary

  1. 1.

    The behavior, proprioceptors, musculature, and innervation of the distal three segments of the antenna of the American lobster,Homarus americanus, were studied.

  2. 2.

    The unrestrained lobster moves the two distal joints of the antenna in two ways: 1) simultaneous extension or flexion at both joints, or 2) movement of the distal segment by itself.

  3. 3.

    Sensory information about the movements at the two joints is provided mainly by two proprioceptors, the MCF chordotonal organ spanning both joints and the CF myochordotonal organ spanning the most distal joint.

  4. 4.

    The MCF chordotonal organ is an unusual proprioceptor in that some of its units respond similarly to movement at either joint.

  5. 5.

    Movement at the two distal joints is controlled by four muscles, one pair of flexors and one pair of extensors.

  6. 6.

    The innervation pattern involves seven excitatory motor neurons: one independent motor neuron to each of the four muscles, one common motor neuron to the flexor muscles, and two common motor neurons to the extensor muscles.

  7. 7.

    Induced joint movements generate resistance-reflex responses: flexion drives the two independent extensor motor neurons E4 and E5 and one of the two common extensor motor neurons EC1; extension drives the independent motor neurons F4 and F5. The response is the same to movement at either joint.

  8. 8.

    Direct mechanical stimulation of the MCF chordotonal organ also generates resistance reflexes: stretch drives the flexor motor neurons F4 and F5; relaxation drives extensor motor neurons E4, E5, and EC1. These responses are similar to those produced by induced joint movement.

  9. 9.

    The functional significance of the relationship between the common proprioceptor and the motor neurons is discussed.

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References

  1. Balss, Heinrich: Decapoda (Zehnfüßer). In: Bronn's Klassen und Ordnungen des Tierreichs5(1), 7, 116–123 (1940)

  2. Burrows, M., Horridge, G.A.: The action of the eyecup muscles of the crab,Carcinus, during optokinetic movements. J. exp. Biol.49, 223–250 (1968)

  3. Clarac, F., Vedel, J.P.: Neurophysiological study of the antenna motor patterns in the rock lobsterPalinurus vulgaris. J. comp. Physiol.102, 201–221 (1975)

  4. Davis, W.J.: The neuromuscular basis of lobster swimmeret beating. J. exp. Zool.168, 363–378 (1968)

  5. Evoy, W.H., Cohen, M.J.: Central and peripheral control of arthropod movements. Advanc. comp. Physiol. Biochem.4, 225–266 (1971)

  6. Hartman, H.B., Austin, W.D.: Proprioceptor organs in the antenna of the decapoda Crustacea. I. Physiology of a chordotonal organ spanning two joints in the spiny lobsterPanulirus interruptus (Randall). J. comp. Physiol.81, 187–202 (1972)

  7. MacMillan, D.L., Dando, M.R.: Tension receptors on the apodemes of muscles in the walking legs of the crab,Cancer pagurus. Mar. Behav. Physiol.1, 185–208 (1972)

  8. Miller, P.L.: Inhibitory nerve to insect spiracles. Nature (Lond.)221, 171–173 (1969)

  9. Pearson, K.G.: Function of peripheral inhibitory axons in insects. Amer. Zool.13, 321–330 (1973)

  10. Pearson, K.G., Illes, J.F.: Innervation of coxal depressor muscles in the cockroach,Periplaneta americana. J. exp. Biol.54, 215–232 (1971)

  11. Sandeman, D.C.: A sensitive position measuring device for biological systems. Comp. Biochem. Physiol.24, 635–638 (1968)

  12. Snow, P.J.: The motor innervation and musculature of the antennule of the hermit crab,Pagurus alaskensis (Benedict). J. exp. Biol.58, 767–784 (1973)

  13. Spirito, C.P.: Reflex control of the opener and stretcher muscles in the cheliped of the fiddler crab,Uca pugnax. J. vergl. Physiol.68, 221–228 (1970)

  14. Taylor, R.C.: The anatomy and adequate stimulation of a chordotonal organ in the antennae of the hermit crab. Comp. Biochem. Physiol.20, 709–717 (1967a)

  15. Taylor, R.C.: Functional properties of the chordotonal organ in the antennal flagellum of a hermit crab. Comp. Biochem. Physiol.20, 719–729 (1967b)

  16. Usherwood, P.N.R, Runion, H.I.: Analysis of the mechanical responses of metathoracic extensor tibiae muscles of free-walking locusts. J. exp. Biol.52, 39–58 (1970)

  17. Vedel, J.P., Clarac, F.: Étude neurophysiologique de la motricité antennaire chez la langoustePalinurus vulgaris. C.R. Acad. Sci. (Paris)278 D, 927–930 (1974)

  18. Vedel, J.P., Clarac, F.: Neurophysiological study of the antennal motor patterns in the rock lobsterPalinurus vulgaris. J. comp. Physiol.102, 223–235 (1975)

  19. Wilson, D.M., Davis, W.J.: Nerve impulse patterns and reflex control in the motor system of the crayfish claw. J. exp. Biol.43, 193–210 (1965)

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Additional information

This research was supported by U.S.P.H.S. Training Grant MH 10641. I thank H.B. Hartman and R.K. Murphey for advice during this work, B. Mulloney for help with the manuscript, and L. Plumb for the drawings.

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Sigvardt, K.A. Sensory-motor interactions in antennal reflexes of the American lobster. J. Comp. Physiol. 118, 195–214 (1977). https://doi.org/10.1007/BF00611823

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Keywords

  • Motor Neuron
  • Sensory Information
  • Mechanical Stimulation
  • Joint Movement
  • Distal Segment