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How do nerves in the dermis detect heat, cold, pain, and pressure?
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human skin
Human skin, whose cells are generated continuously by the body, serves as a protective barrier between the inside of the human body and the environment.
Nerves in the dermis detect heat, cold, pain, and pressure through a complex network of specialized sensory receptors and nerve endings that extend into the skin's papillae.1
Sensory Receptors
The skin utilizes both free nerve endings and various corpuscular endings to monitor environmental stimuli:23
- Mechanoreceptors: These detect pressure and touch. They include Merkel cells and Ruffini endings, which are slowly adapting, as well as Meissner corpuscles and Pacinian corpuscles, which are rapidly adapting and sensitive to vibration.24
- Thermoreceptors: These detect temperature changes. While some mechanoreceptors are sensitive to thermal shifts, specific thermoreceptors exist to monitor warming and cooling. Cold receptors are more numerous than warm receptors and are often served by thinly myelinated A-fibres.5
- Pain Receptors (Nociceptors): These respond to potentially damaging stimuli. Some heat-sensing thermoreceptors function dually as nociceptors. Additionally, polymodal C-fibres can mediate painful sensations, such as the burning feeling associated with extreme cold.56
These receptors convert physical stimuli into electrical signals through a process called transduction, which are then transmitted to the brain for processing.54