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Cutaneous receptor

From Wikipedia, the free encyclopedia

A cutaneous receptor is the type of sensory receptor found in the skin ( the dermis or epidermis). They are a part of the somatosensory system. Cutaneous receptors include mechanoreceptors (pressure or distortion), nociceptors (pain), and thermoreceptors (temperature).[1]

Types

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The sensory receptors in the skin are:

Modalities

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With the above-mentioned receptor types the skin can sense the modalities touch, pressure, vibration, temperature and pain. The modalities and their receptors are partly overlapping, and are innervated by different kinds of fiber types.

Cutaneous receptors
Modality Type Fiber type
Touch Rapidly adapting cutaneous mechanoreceptors (tactile corpuscles
Pacinian corpuscles
hair follicle receptors
some free nerve endings)
Aβ fibers
Touch and pressure Slowly adapting cutaneous mechanoreceptors (Merkel nerve ending and bulbous corpuscles
some free nerve endings)
Aβ fibers (Merkel and Ruffini's), Aδ fibers (free nerve endings)
Vibration Tactile corpuscles and Pacinian corpuscles Aβ fibers
Temperature Thermoreceptors Aδ fibers (cold receptors)
C fibers (warmth receptors)
Pain and Itch Free nerve ending nociceptors Aδ fibers (Nociceptors of neospinothalamic tract)
C fibers (Nociceptors of paleospinothalamic tract)

Morphology

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Cutaneous receptors are at the ends of afferent neurons. works within the capsule. Ion channels are situated near these networks.

In sensory transduction, the afferent nerves transmit through a series of synapses in the central nervous system, first in the spinal cord, the ventrobasal portion of the thalamus, and then on to the somatosensory cortex.[2]

See also

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References

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  1. ^ Lincoln R. J., Boxshall G. A. (1990): Natural history - The Cambridge illustrated dictionary. Cambridge University Press, Cambridge, ISBN 0 521 30551-9.
  2. ^ Mada S. S. (2000): Human Biology. McGraw–Hill, New York, ISBN 0-07-290584-0.