How do mechanoreceptors in the skin respond to pressure and vibration?

Mechanoreceptors in the skin function as biological transducers that convert mechanical energy into electrical impulses, allowing the nervous system to perceive pressure and vibration. These receptors are categorized by their adaptation rates and specific sensitivities.12

Response to Pressure

Pressure is detected by both slowly and rapidly adapting mechanoreceptors.1
* Slowly adapting receptors: Merkel endings and Ruffini endings provide information about the force of mechanical stimulation and are responsible for sensing steady pressure.213
* Rapidly adapting receptors: Meissner corpuscles and hair follicle receptors respond to superficial light touch and changes in pressure.23

When pressure is applied, it causes the deformation of the receptor structure, leading to a shift in chemical ions and the generation of a receptor potential. Once this potential reaches a threshold, it triggers a nerve impulse.1

Response to Vibration

Vibration is primarily detected by rapidly adapting mechanoreceptors, most notably the Pacinian corpuscles. These structures act like shock absorbers, damping out slow changes while transmitting fast, high-frequency events. They are highly sensitive to alternating stimuli and can detect vibrations across a wide range of frequencies, with human sensitivity peaking near 200 cycles per second.2341