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How do mechanoreceptors convert touch or pressure into electrical nerve signals?
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Mechanoreception
In human skin, specialized nerve endings known as Meissner's corpuscles (or tactile corpuscles) are sensitive to touch. They are one of several different types of mechanoreceptors found in human skin.
Mechanoreceptors convert physical stimuli, such as touch or pressure, into electrical signals through a process known as transduction. This transformation occurs when mechanical energy acts upon specialized sensory receptor cells, triggering the activation of ion channels within their membranes.12
The specific mechanism typically involves the following steps:
- Mechanical Stress: When a stimulus like touch or muscle stretch occurs, it exerts mechanical stress on the cell, often affecting protein filaments of the cytoskeleton.2
- Channel Activation: This stress alters the shape of ion channels, inducing them to open. In some cases, such as in certain fruit fly receptors, these channels are triggered directly by membrane stretch.21
- Ion Flux and Depolarization: The opening of these channels allows cations (such as sodium) to diffuse into the cell. This influx of positive charge causes the cell membrane to depolarize, creating a local electrical response known as a receptor potential.12
- Nerve Impulse: If this depolarization reaches a specific threshold, it triggers an action potential, which is the electrical nerve impulse that travels to the brain.32