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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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The inner core enables transient touch detection in the Pacinian corpuscle.

Luke H Ziolkowski1, Yury A Nikolaev1, Akitoshi Chikamoto1

  • 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520, USA.

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Summary

Pacinian corpuscles detect touch and vibration. Lamellar Schwann cells (LSCs) and the inner core, not the outer core, enable sensory tuning through their interplay with the afferent terminal.

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Cell Biology

Background:

  • Pacinian corpuscles are vertebrate mechanoreceptors detecting transient touch and vibration.
  • Their structure involves a mechanoreceptor afferent, lamellar Schwann cells (LSCs), and a multilayered outer core.
  • The precise roles of these components in sensory tuning remain unclear.

Purpose of the Study:

  • To elucidate the three-dimensional architecture of Pacinian corpuscles.
  • To determine the contribution of cellular components to touch and vibration detection.
  • To challenge the prevailing model of the outer core's function.

Main Methods:

  • 3D structural analysis of Pacinian corpuscles.
  • Investigation of cellular component roles in mechanosensation.
  • Electrophysiological analysis of afferent terminal function.

Main Results:

  • The outer core is dispensable for sensory tuning to transient stimuli.
  • The inner core and LSCs are crucial for touch and vibration detection.
  • LSCs act as additional touch sensors, potentiating afferent terminal mechanosensitivity.
  • The afferent terminal detects touch via fast-inactivating ion channels.

Conclusions:

  • Pacinian corpuscle's sensory tuning arises from the inner core and LSCs, not the outer core.
  • Lamellar Schwann cells (LSCs) play a vital role as mechanosensors.
  • Functional tuning results from the interaction between LSCs and the afferent terminal within the inner core.