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Role of Single Mechanoreceptor Units in Tactile Sensation

  • H. E. Torebjörk
  • J. L. Ochoa
  • W. J. L. Schady
Chapter
Part of the Wenner-Gren Center International Symposium Series book series (EMISS, volume 12)

Abstract

A fundamental task of the hand is to extract information about surface structure, shape and weight of objects during manual exploration and manipulation. Much of this information is signalled from low-threshold mechanoreceptive units in the skin. Deep receptors of various types are also involved in the complex feedback mechanisms for motor control. We know from microneurographic studies in man that there are four basic types of low-threshold mechanoreceptive units in the glabrous skin of the hand. Extrapolation from animal experiments suggests that RA units are connected to Meissner corpuscles, PC units to Pacinian corpuscles, SA I units to Merkel disks, and SA II units to Ruffini end-organs (Lindblom and Lund, 1966; Iggo and Muir, 1969; Lynn, 1969; Chambers et al., 1972; Iggo and Ogawa, 1977). Detailed information is at present available about the stimulus-response functions, receptive field characteristics and innervation densities of these four unit types in the fingers and palm (Knibestöl and Vallbo, 1970; 1980; Knibestöl, 1973; 1975; Vallbo and Johansson, 1978; Johansson, 1978; Johansson and Vallbo, 1979; Johansson et al., 1982). Much less is known about the role of these mechano-receptive units in sensory experience. Here we describe a new technique for studying sensory correlates of single mechanore-ceptive unit activation and discuss the contribution of these units to tactile sensation and motor control.

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References

  1. Chambers, N.R., Andres, K.H., von Düring, M., Iggo, A., (1972). The structure and function of the slowly adapting type II mechanoreceptor in hairy skin. Q. J. Exp. Physiol., 57, 417–455Google Scholar
  2. Eklund, G., Hagbarth, K.E., Torebjörk, H.E., (1978). Exteroceptive vibration-induced finger flexion reflex in man. J. Neurol. Neurosurg. Psychiat., 41, 438–443PubMedCentralPubMedCrossRefGoogle Scholar
  3. Hulliger, M., Nordh, E., Thelin, A.-E., Vollbo, A.B., (1979). The response of afferent fibres from the glabrous skin of the hand during voluntary finger movements in man. J. Physiol., 291, 233–249PubMedCentralPubMedGoogle Scholar
  4. Iggo, A., Muir, A.R. (1969), The structure and function of a slowly adapting touch corpuscle in hairy skin. J. Physiol., 200, 783–796Google Scholar
  5. Iggo, A., Ogawa, H. (1977). Correlative physiological and morphological studies of rapidly adapting mechanoreceptors in cat’s glabrous skin. J. Physiol., 266, 275–296PubMedCentralPubMedGoogle Scholar
  6. Johansson, R.S., (1978). Tactile sensibility in the human hand: receptive field characteristics of mechanoreceptor units in the glabrous skin. J. Physiol., 281, 101–123PubMedCentralPubMedGoogle Scholar
  7. Johansson, R.S., Landström, U., Lundström, R., (1982). Sensitivity to edges of mechanoreceptive afferent units innervating the glabrous skin of the human hand. Brain Res., 244, 27–32PubMedCrossRefGoogle Scholar
  8. Johansson, R.S., Vallbo, Å.B. (1976). Skin mechanoreceptors in-the human hand: an inference of some population properties. In Sensory Functions of the Skin in Primates (ed. Y. Zotterman ). Pergamon Press, Oxford, pp 171–84Google Scholar
  9. Johansson, R.S., Vallbo, Å.B. (1979). Tactile sensibility in the human hand: relative and absolute densities of four types of mechano-receptive units in the glabrous skin area. J. Physiol., 286, 283–300PubMedCentralPubMedGoogle Scholar
  10. Knibestöl, M., (1973). Stimulus-response functions of rapidly adapting mechanoreceptors in the human glabrous skin area. J. Physiol., 232, 427–452PubMedCentralPubMedGoogle Scholar
  11. Knibestöl M., (1975). Stimulus-response functions of slowly adapting mechanoreceptors in the human glabrous skin area. J. Physiol. 245, 83–80Google Scholar
  12. Knibestöl, N., Vallbo Å.B. (1970). Single unit analysis of mechanoreceptor activity from the human glabrous skin. Asca Physiol. Scand., 80, 178–195CrossRefGoogle Scholar
  13. Knibestöl, M., Vallbo, Å.B. (1980). Intensity of sensation related to activity of slowly adapting mechano-receptive units in the human hand, J. Physiol., 300, 251–267PubMedCentralPubMedGoogle Scholar
  14. Lindblom, U., Lund, L., (1968). The discharge from vibration-sensitive receptors in the monkey foot. Exp. Neurol., 15, 401–417CrossRefGoogle Scholar
  15. Lynn, B. (1969). The nature and location of certain phasic mechanoreceptors in cat’s foot pad. J. Physiol., 201, 768–773Google Scholar
  16. Ochoa, J.L., Torebjörk, H.E., (1983). Sensations evoked by intraneural microstimulation of single mechanoreceptor units innervating the human hand. J. Physiol., 342, 633–854PubMedCentralPubMedGoogle Scholar
  17. Schady, W.J.L., Ochoa, J.L., Torebjörk, H.E., Chen, L.S. (1983a). Peripheral projections of fascicles in the human median nerve. Brain. 106, 745–760PubMedCrossRefGoogle Scholar
  18. Schady, W.J.L., Tozebjörk, H.E., (1983). Projected and receptive fields: a comparison or projected areas of sensations evoked by intraneural stimulation of mechanoreceptive units, and their innervation territories. Acta Physiol. Scand., 119, 267–275PubMedCrossRefGoogle Scholar
  19. Schady, W.J.L., Torebjörk, H.E., Ochoa, J.L., (1983b). Cerebral localisation function from the input of single mechanoreceptive units in man. Acta Physiol. Scand., 119, 277–285CrossRefGoogle Scholar
  20. Schady, W.J.L., Torebjörk, H.E., Ochoa, J.L., (1983c). Peripheral projections of nerve fibres in the human median nerve. Brain Res., 277, 249–281CrossRefGoogle Scholar
  21. Talbot, W.H., Darian-Smith, T., Kornhuber, H.H., Mountcastle, V.B., (1968). The sense of flutter-vibration: comparisons of the human capacity with response patterns of mechanoreceptive afferents from the monkey hand. J. Neurophysiol. 31, 301–334PubMedGoogle Scholar
  22. Torebjörk, H.E., Hagbarth, K.E., Eklund, G. (1978). Tonic finger flexion reflex induced by vibratory activation of digital mechanoreceptors. In Active Touch (ed. G. Gordon ). Pergamon Press, Oxford, pp. 197–203Google Scholar
  23. Torebjörk, H.E., Hallin, R.G., Hongell, A., Hagbarth, K.E., (1970). Single unit potentials with complex waveform seen in microelectrode recordings from the human median nerve. Brain Res., 24, 443–450PubMedCrossRefGoogle Scholar
  24. Torebjörk, H.E., Ochoa, J.L., (1980). Specific sensations evoked by activity in single identified sensory units in man. Acta Physiol.Scand., 110, 445–447PubMedCrossRefGoogle Scholar
  25. Vallbo, Å.B., (1976). Prediction of propagation block on the basis of impulse shape in single unit recordings from human nerves. Acta Physiol. Scand., 97, 66–74PubMedCrossRefGoogle Scholar
  26. Vallbo, Å.B., (1981). Sensations evoked from the glabrous skin of the human hand by electrical stimulation of unitary mechanosensitive afferents. Brain Res., 215, 359–363PubMedCrossRefGoogle Scholar
  27. Vallbo, Å.B., Johansson R.S. (1978). Skin mechanoreceptors in the human hand: neural and psychophysical thresholds. In Sensory Functions of the Skin in Primates, (ed. Y. Zotterman ). Pergamon Press, Oxford, pp 185–199Google Scholar
  28. Vollbo, Å.B., Johansson, R. (1978). The tactile sensory innervation of the glabrous skin of the human hand. In Active Touch (ed. C. Gordon ). Pergamon Press, Oxford, pp 29–54Google Scholar

Copyright information

© The Wenner-Gren Center 1984

Authors and Affiliations

  • H. E. Torebjörk
    • 1
  • J. L. Ochoa
    • 2
  • W. J. L. Schady
    • 1
  1. 1.Department of Clinical NeurophysiologyUniversity HospitalUppsalaSweden
  2. 2.Department of NeurologyUniversity of Wisconsin Medical SchoolMadisonUSA

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