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Related Concept Videos

Sensory Functions of the Skin01:16

Sensory Functions of the Skin

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The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
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Somatosensation01:33

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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A cutaneous mechanoneural interface for neuroprosthetic feedback.

Shriya S Srinivasan1,2, Hugh M Herr3

  • 1MIT Media Lab, Center for Extreme Bionics, Massachusetts Institute of Technology, Cambridge, MA, USA. shriyas@mit.edu.

Nature Biomedical Engineering
|February 2, 2021
PubMed
Summary

Researchers developed a novel cutaneous mechanoneural interface for prosthetic tactile feedback. This system uses muscle actuation to stimulate skin, effectively restoring graded contact and vibratory sensations lost after amputation.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • Amputation results in the loss of sensory end organs, preventing natural cutaneous neuroprosthetic feedback.
  • Existing prosthetic technologies lack effective anatomical interfaces for restoring tactile sensation.

Purpose of the Study:

  • To design and evaluate a novel cutaneous mechanoneural interface for tactile feedback in amputees.
  • To create an anatomical interface using a muscle actuator and skin flap to elicit natural sensory responses.

Main Methods:

  • Developed a cuff-like interface coupling a muscle actuator to a pedicled skin flap.
  • Used electrical stimulation of the muscle to induce skin strains and vibrations proportional to contact.
  • Performed biomechanical and electrophysiological evaluations in rat hindlimbs.

Main Results:

  • The interface successfully elicited native dermal mechanotransducers, generating graded contact and vibratory afferents.
  • Stimulation patterns independently engaged slowly and rapidly adapting mechanotransducers, mimicking natural sensations.
  • Responses were comparable to mechanical stimulation of intact skin.

Conclusions:

  • The cutaneous mechanoneural interface effectively recreates tactile sensations by stimulating native mechanotransducers.
  • This technology offers a viable solution for integrating tactile feedback into current prosthetic devices.
  • Potential to significantly improve sensory restoration and functional outcomes for amputees.