A cutaneous receptor is a sensory receptor found in the skin that provides information about temperature, touch (including vibration and pain), spatial orientation,pressure (stretching or squeezing), and metabolic circumstances (including those induced by external chemical substances). The main four types of cutaneous receptors are tactile corpuscles, bulbous corpuscles, Pacinian corpuscles, and Merkel nerve endings, although the latter do not qualify as sensory corpuscles in the narrow sense.
Types
The sensory receptors in the skin are:
- Mechanoreceptors
- Bulbous corpuscles (skin stretch)
- Bulboid corpuscles (Cold)
- Tactile corpuscles (changes in texture, slow vibrations)
- Pacinian corpuscles (deep pressure, fast vibrations)
- Merkel nerve endings (sustained touch and pressure)
- Free nerve endings
- thermoreceptor
- nociceptors
- chemoreceptors
Modalities
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.
| 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
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.
See also
- Sense
- Receptor
- Skin
- Epithelium
- Opsin § Opsins in the human eye, brain, and skin
References
- Cobo, Ramón; García-Piqueras, Jorge; Cobo, Juan; Vega, José A. (2021-01-10). "The Human Cutaneous Sensory Corpuscles: An Update". Journal of Clinical Medicine. 10 (2): 227. doi:10.3390/jcm10020227. ISSN 2077-0383. PMC 7827880. PMID 33435193.
- Mada S. S. (2000): Human Biology. McGraw–Hill, New York, ISBN 0-07-290584-0.
A cutaneous receptor is a sensory receptor found in the skin that provides information about temperature touch including vibration and pain spatial orientation pressure stretching or squeezing and metabolic circumstances including those induced by external chemical substances The main four types of cutaneous receptors are tactile corpuscles bulbous corpuscles Pacinian corpuscles and Merkel nerve endings although the latter do not qualify as sensory corpuscles in the narrow sense TypesThe sensory receptors in the skin are Mechanoreceptors Bulbous corpuscles skin stretch Bulboid corpuscles Cold Tactile corpuscles changes in texture slow vibrations Pacinian corpuscles deep pressure fast vibrations Merkel nerve endings sustained touch and pressure Free nerve endings thermoreceptor nociceptors chemoreceptorsModalitiesWith 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 typeTouch Rapidly adapting cutaneous mechanoreceptors tactile corpuscles Pacinian corpuscles hair follicle receptors some free nerve endings Ab fibersTouch and pressure Slowly adapting cutaneous mechanoreceptors Merkel nerve ending and bulbous corpuscles some free nerve endings Ab fibers Merkel and Ruffini s Ad fibers free nerve endings Vibration Tactile corpuscles and Pacinian corpuscles Ab fibersTemperature Thermoreceptors Ad fibers cold receptors C fibers warmth receptors Pain and Itch Free nerve ending nociceptors Ad fibers Nociceptors of neospinothalamic tract C fibers Nociceptors of paleospinothalamic tract MorphologyCutaneous 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 See alsoSense Receptor Skin Epithelium Opsin Opsins in the human eye brain and skinReferencesCobo Ramon Garcia Piqueras Jorge Cobo Juan Vega Jose A 2021 01 10 The Human Cutaneous Sensory Corpuscles An Update Journal of Clinical Medicine 10 2 227 doi 10 3390 jcm10020227 ISSN 2077 0383 PMC 7827880 PMID 33435193 Mada S S 2000 Human Biology McGraw Hill New York ISBN 0 07 290584 0
